View source for Byzantine navy

{{short description|Naval force of the Byzantine Empire}}
{{featured article}}
{{Infobox War Faction
| name             = Byzantine navy
| war              = the [[Justinian I#Military activities|Justinianic Wars]], latter half of the [[Roman–Persian Wars]], the [[Arab–Byzantine wars]], the [[Byzantine–Bulgarian wars]], the [[Rus'–Byzantine War (disambiguation)|Rus'–Byzantine wars]], the [[Byzantine–Norman wars]], the [[Crusades]] and the [[Byzantine–Ottoman wars]]
| image            = [[File:Byzantine imperial flag, 14th century.svg|200px]]
| caption          = The imperial ensign (''basilikon phlamoulon'') with the [[tetragrammic cross]], carried by Byzantine warships in the 14th century, as described by [[Pseudo-Kodinos]] and illustrated in the Castilian atlas ''[[Libro del Conoscimiento|Conosçimiento de todos los reynos]]'' ({{circa|1350}}){{sfn|Verpeaux|1966|p=167}}<ref>{{cite web | title =Other Byzantine flags shown in the "Book of All Kingdoms" (14th century) | url=http://flagspot.net/flags/gr_byz.html#oth | publisher=Flags of the World | access-date=2010-08-07}}</ref>
| active           = 330–1453
| ideology         = 
| leaders          = [[Byzantine Emperor]] (Commander-in-chief);<br /> {{translit|grc|[[droungarios tou ploimou|droungarios tou ploïmou]]}} and [[theme (Byzantine district)|thematic]] {{translit|grc|[[strategos|strategoi]]}} (8th–11th centuries), <br /> {{translit|grc|[[megas doux]]}} (after {{circa|1092}})
| headquarters     = [[Constantinople]]
| area             = [[Mediterranean Sea]], [[Danube]], [[Black Sea]]
| size             = {{circa|42,000}} men in 899.{{sfn|Treadgold|1998|p=67}} <br /> {{circa|300}} warships in 9th–10th centuries.{{sfn|Treadgold|1998|p=85}}
c. 150 warships under [[Manuel Komnenos]].
| partof           = [[Byzantine Empire]]
| predecessor      = [[Roman navy]]
| allies           = [[Venetian navy|Venice]], [[Republic of Genoa|Genoa]], [[Republic of Pisa|Pisa]], [[Crusader states]], [[Aydinids]]
| opponents        = [[Vandals]], [[Ostrogothic Kingdom|Ostrogoths]], [[Sassanids]], [[Umayyad]] and [[Abbasid]] [[Caliphate]]s, [[Emirate of Crete]], [[Fatimid navy|Fatimids]], [[Slavs]], Bulgarians, [[Rus' (people)|Rus']], [[Normans]], [[Republic of Genoa|Genoa]], [[Venetian navy|Venice]], [[Republic of Pisa|Pisa]], [[Crusader states]], [[Sultanate of Rûm|Seljuks]], [[Anatolian beyliks]], [[Ottoman Navy|Ottomans]]
}}

The '''Byzantine navy''' was the [[Navy|naval force]] of the [[Byzantine Empire]]. Like the state it served, it was a direct continuation from its [[Roman navy|Roman predecessor]], but played a far greater role in the defence and survival of the state than its earlier iteration. While the fleets of the [[Roman Empire]] faced few great naval threats, operating as a policing force vastly inferior in power and prestige to the [[Roman army|army]], [[command of the sea]] became vital to the very existence of the Byzantine state, which several historians have called a "maritime empire".{{sfn|Lewis|Runyan|1985|p=20}}{{sfn|Scafuri|2002|p=1}}

The first threat to Roman hegemony in the [[Mediterranean Sea]] was posed by the [[Vandals]] in the 5th century, but their threat was ended by the wars of [[Justinian I]] in the 6th century. The re-establishment of a permanently maintained fleet and the introduction of the [[dromon]] galley in the same period also marks the point when the Byzantine navy began departing from its late Roman roots and developing its own characteristic identity. This process would be furthered with the onset of the [[early Muslim conquests]] in the 7th century. Following the loss of the [[Levant]] and later Africa, the Mediterranean was transformed from a "Roman lake" into a battleground between the Byzantines and a series of Muslim states. In this struggle, the Byzantine fleets were critical, not only for the defence of the Empire's far-flung possessions around the Mediterranean basin, but also for repelling seaborne attacks against the imperial capital of [[Constantinople]] itself. Through the use of the newly invented "[[Greek fire]]", the Byzantine navy's best-known and feared secret weapon, Constantinople was saved from [[List of sieges of Constantinople|several sieges]] and numerous naval engagements resulted in Byzantine victories.

Initially, the defence of the Byzantine coasts and the approaches to Constantinople was borne by the great fleet of the {{translit|grc|[[Karabisianoi]]}}. Progressively however it was split up into several [[Theme (Byzantine district)|regional]] fleets, while a central Imperial Fleet was maintained at Constantinople, guarding the city and forming the core of naval expeditions. By the late 8th century, the Byzantine navy, a well-organized and maintained force, was again the dominant maritime power in the Mediterranean. Conflicts with navies of the [[Muslim world]] continued with alternating success, but in the 10th century, the Byzantines were able to gain supremacy in the Eastern Mediterranean.

During the 11th century, the navy, like the Empire itself, began to decline. Faced with new naval challenges from the West, the Byzantines were increasingly forced to rely on the navies of Italian city-states such as [[Republic of Venice|Venice]] and [[Republic of Genoa|Genoa]], with disastrous effects on the Empire's economy and sovereignty. A [[Komnenian restoration|period of recovery]] under the [[Byzantine Empire under the Komnenos dynasty|Komnenos dynasty]] was followed by another period of decline, which culminated in the disastrous dissolution of the Empire by the [[Fourth Crusade]] in 1204. After the Empire was restored in 1261, several emperors of the [[Byzantine Empire under the Palaiologos dynasty|Palaiologan dynasty]] attempted to revive the navy, but their efforts only had a temporary effect. Emperor [[Andronikos II Palaiologos]] even dissolved the navy completely, allowing Venice to defeat the Byzantines in two wars, the first of which resulted in a humiliating treaty that saw the Venetians keep multiple islands captured from Byzantine forces during the war and forced the latter to repay Venice for the destruction of Constantinople's Venetian quarter at the hands of the city's Genoese residents. By the mid-14th century, the Byzantine fleet, which once could put hundreds of warships to sea, was limited to a few dozen at best, and control of the [[Aegean Sea]] definitively passed to Italian navies and, in the 15th century, the nascent [[Ottoman Navy]]. The diminished Byzantine navy continued to be active until the [[fall of Constantinople]] to the [[Ottoman Empire]] in 1453.

{{Byzantine Military}}

==Operational history==
===Early period===
====Civil wars and barbarian invasions: the 4th and 5th centuries====
[[File:Shepherd 526-600.jpg|thumb|By the late 5th century, the Western Mediterranean had fallen into the hands of barbarian kingdoms. The conquests of Justinian I restored Roman control over the entire sea, which would last until the Muslim conquests in the latter half of the 7th century.]]

The Byzantine navy, like the Eastern Roman or Byzantine Empire itself, continued the systems of the [[Roman Empire]]. After the [[Battle of Actium]] in 31&nbsp;BC, in the absence of any external threat in the Mediterranean, the Roman navy performed mostly policing and escort duties. Massive sea battles, like those fought centuries before in the [[Punic Wars]] (264 to 146&nbsp;BC), no longer occurred, and the Roman fleets comprised relatively small vessels, best suited to their new tasks. By the early 4th century AD, the permanent Roman fleets had dwindled, so that when the fleets of the rival emperors [[Constantine the Great]] and [[Licinius]] [[Battle of the Hellespont|clashed in 324&nbsp;AD]],{{sfn|Norwich|1990|pp=48–49}} they were composed to a great extent of newly built or -commandeered ships from the port cities of the Eastern Mediterranean.{{sfn|Casson|1991|p=213}} The civil wars of the 4th and early 5th centuries, however, did spur a revival of naval activity, with fleets mostly employed to transport armies.{{sfn|Pryor|Jeffreys|2006|p=7}} Considerable naval forces continued to be employed in the Western Mediterranean throughout the first quarter of the fifth century, especially from North Africa, but Rome's mastery of the Mediterranean was challenged when Africa was overrun by the [[Vandals]]{{sfn|Pryor|Jeffreys|2006|p=8}} (429 to 442).

The new [[Vandalic Kingdom]] of [[Carthage]], under the capable [[Geiseric]] ({{reign|428|477}}), immediately launched raids against the coasts of Italy and Greece, even [[Sack of Rome (455)|sacking and plundering]] Rome in 455.{{sfn|Pryor|Jeffreys|2006|p= 9}} The Vandal raids continued unabated over the next two decades, despite repeated Roman attempts to defeat them.{{sfn|Pryor|Jeffreys|2006|p=9}} The Western Empire was impotent, its navy having dwindled to almost nothing,{{sfn|MacGeorge|2002|pp= 306–307}} but the eastern emperors could still call upon the resources and naval expertise of the eastern Mediterranean. A first Eastern expedition in 448, however, went no further than Sicily, and in 460, the Vandals attacked and destroyed a Western Roman invasion fleet at [[Battle of Cartagena (461)|Cartagena]] in Spain.{{sfn|Pryor|Jeffreys|2006|p= 9}} Finally, in 468, a huge Eastern expedition assembled under [[Basiliscus]], reputedly numbering 1,113 ships and 100,000 men, but it failed disastrously. About 600 ships were lost to [[fire ship]]s, and the financial cost of 130,000 pounds of gold and 700,000 pounds of silver nearly bankrupted the Empire.{{sfn|Norwich|1990|p= 166}} This forced the Romans to come to terms with Geiseric and to sign a peace treaty. After Geiseric's death in 477, however, the Vandal threat receded.{{sfn|Pryor|Jeffreys|2006|p= 10}}

====Sixth century – Justinian restores Roman control over the Mediterranean====
The 6th century marked the rebirth of Roman naval power. In 508, as antagonism with the [[Ostrogothic Kingdom]] of [[Theodoric the Great|Theodoric]] flared up, the Emperor [[Anastasius I (emperor)|Anastasius I]] ({{reign|491|518}}) is reported to have sent a fleet of 100 warships to raid the coasts of Italy.{{sfn|Pryor|Jeffreys|2006|p=13}} In 513, the general [[Vitalian (general)|Vitalian]] revolted against Anastasius. The rebels assembled a fleet of 200 ships which, despite some initial successes, were destroyed by admiral [[Marinus (praetorian prefect)|Marinus]], who employed a sulphur-based incendiary substance to defeat them.{{sfn|Hocker|1995|p=90}}

In 533, taking advantage of the absence of the Vandal fleet, sent to suppress a revolt in [[Sardinia]], an army of 15,000 under [[Belisarius]] was transported to Africa by an invasion fleet of 92 [[dromon]]s and 500 transports,{{sfn|Norwich|1990|p=207}} beginning the [[Vandalic War]], the first of the wars of the reconquest of Emperor [[Justinian I]] ({{reign|527|565}}). These were largely amphibious operations, made possible by the control of the Mediterranean waterways, and the fleet played a vital role in carrying supplies and reinforcements to the widely dispersed Byzantine expeditionary forces and garrisons.{{sfn|Hocker|1995|p=90}} This fact was not lost on the Byzantines' enemies. Already in the 520s, Theodoric had planned to build a massive fleet directed against the Byzantines and the Vandals, but his death in 526 limited the extent to which these plans were realized.{{sfn|Pryor|Jeffreys|2006|p=14}} In 535, the [[Gothic War (535–554)|Gothic War]] began with a double-pronged Byzantine offensive, with a fleet again carrying Belisarius' army to Sicily and then Italy, and another army invading [[Dalmatia]]. Byzantine control of the sea was of great strategic importance, allowing the smaller Byzantine army to successfully occupy the peninsula by 540.{{sfn|Pryor|Jeffreys|2006|pp=14–15}}

In 541 however, the new Ostrogoth king, [[Totila]], created a fleet of 400 warships with which to deny the seas around Italy to the Empire. Two Byzantine fleets were destroyed near Naples in 542,{{sfn|Pryor|Jeffreys|2006|p=15}} and in 546, Belisarius personally commanded 200 ships against the Gothic fleet that blockaded the mouths of the [[Tiber]], in an unsuccessful effort to [[Sack of Rome (546)|relieve Rome]].{{sfn|Norwich|1990|p=77}} In 550, Totila invaded Sicily, and over the next year, his 300-ship fleet captured Sardinia and [[Corsica]], and raided [[Corfu]] and the coast of [[Epirus]].{{sfn|Pryor|Jeffreys|2006|pp=17–18}} However, a defeat in a sea battle off [[Battle of Sena Gallica (551)|Sena Gallica]] marked the beginning of the final Imperial ascendancy.{{sfn|Hocker|1995|p=90}} With the final conquest of Italy and [[Spania|southern Spain]] under Justinian, the Mediterranean once again became a "Roman lake".{{sfn|Hocker|1995|p=90}}

Despite the subsequent loss of much of Italy to the [[Lombards]], the Byzantines maintained control of the seas around the peninsula. As the Lombards rarely ventured to sea, the Byzantines were able to retain several coastal strips of Italian territory for centuries.{{sfn|Pryor|Jeffreys|2006|pp=19, 24}} The only major naval action of the next 80 years occurred during the [[Siege of Constantinople (626)|siege of Constantinople]] by the [[Sassanid Empire|Sassanid Persians]], [[Avars (Carpathians)|Avars]] and Slavs in 626. During that siege, the Slavs' fleet of {{translit|grc|[[monoxyla]]}} was intercepted by the Byzantine fleet and destroyed, denying the [[Sassanid army|Persian army]] passage across the [[Bosporus]] and eventually forcing the Avars to retreat.{{sfn|Norwich|1990|pp=259–297}}

===Struggle against the Arabs===
====Emergence of the Arab naval threat====
{{details|topic=this period|Byzantine Empire under the Heraclian dynasty}}
[[File:Byzantine-Arab naval struggle.svg|thumb|center|upright=4|Map of the main Byzantine-Muslim naval operations and battles in the Mediterranean, 7th–11th centuries.]]
During the 640s, the [[Early Muslim conquests|Muslim conquest]] of [[Syria (region)|Syria]] and [[Egypt]] created a new threat to Byzantium. Not only did the Arabs conquer significant recruiting and revenue-producing areas, but, after the utility of a strong navy was demonstrated by the short-lived Byzantine recapture of [[Alexandria]] in 644, they took to creating [[Early Caliphate navy|a navy of their own]]. In this effort the new Muslim elite, which came from the inland-oriented northern part of the [[Arabian peninsula]], largely relied on the resources and manpower of the conquered [[Levant]] (especially the [[Copts]] of Egypt), which until a few years previously had provided ships and crews for the Byzantines.{{sfn|Campbell|1995|pp=9–10}}{{sfn|Hocker|1995|p=91}}{{sfn|Casson|1995|p=154}} There is, however, evidence that in the new naval bases in Palestine shipwrights from Persia and Iraq were also employed.{{sfn|Nicolle|1996|p=47}} The lack of illustrations earlier than the 14th century means that nothing is known about the specifics of the early Muslim warships, although it is usually assumed that their naval efforts drew upon the existing Mediterranean maritime tradition. Given a largely shared nautical nomenclature, and the centuries-long interaction between the two cultures, Byzantine and Arab ships shared many similarities.{{sfn|Hocker|1995|p=98}}{{sfn|Pryor|1988|p=62}}{{sfn|Nicolle|1996|p=87}} This similarity also extended to tactics and general fleet organization; translations of [[Byzantine military manuals]] were available to the Arab admirals.{{sfn|Hocker|1995|p=98}}

{{quote box
| width     = 260px
| align     = right
| bgcolor   = #c6dbf7
| quote     = "At that time Kallinikos, an artificer from [[Baalbek|Heliopolis]], fled to the Romans. He had devised a [[Greek fire|sea fire]] which ignited the Arab ships and burned them with all hands. Thus it was that the Romans returned with victory and discovered the sea fire."
| source    = Chronicle of [[Theophanes the Confessor]], ''[[Annus Mundi]]'' 6165.{{sfn|Turtledove|1982|p=53}}
}}

After seizing [[Cyprus]] in 649 and raiding Rhodes, Crete and Sicily, the young Arab navy decisively defeated the Byzantines under the personal command of Emperor [[Constans II]] (641–668) in the [[Battle of the Masts]] of 655.{{sfn|Pryor|Jeffreys|2006|p=25}} This catastrophic Byzantine defeat opened up the Mediterranean to the Arabs and began a centuries-long series of naval conflicts over the control of the Mediterranean waterways.{{sfn|Pryor|Jeffreys|2006|p=25}}{{sfn|Lewis|Runyan|1985|p=24}} From the reign of [[Muawiyah I]] (661–680), raids intensified, as preparations were made for a great assault on Constantinople itself. In the long [[Siege of Constantinople (674–678)|first Arab siege]] of Constantinople, the Byzantine fleet proved instrumental to the survival of the Empire: the Arab fleets were defeated through the use of its newly developed secret weapon, known as "[[Greek fire]]". The Muslim advance in Asia Minor and the Aegean was halted, and an agreement to a thirty-year truce concluded soon after.{{sfn|Pryor|Jeffreys|2006|pp=26–27}}

In the 680s, [[Justinian II]] ({{reign|685|695|705|711}}) paid attention to the needs of the navy, strengthening it by the resettlement of over 18,500 [[Mardaites]] along the southern coasts of the Empire, where they were employed as [[Marine (military)|marines]] and rowers.{{sfn|Treadgold|1998|p=72}} Nevertheless, the Arab naval threat intensified as they [[Umayyad conquest of North Africa|gradually took control]] of [[Exarchate of Africa|North Africa]] in the 680s and 690s.{{sfn|Lewis|Runyan|1985|p=27}} The last Byzantine stronghold, Carthage, fell in 698, although a Byzantine naval expedition managed to [[Battle of Carthage (698)|briefly retake it]].{{sfn|Norwich|1990|p=334}} The Arab governor [[Musa bin Nusair]] built a new city and naval base at [[Tunis]], and 1,000 Coptic shipwrights were brought to construct a new fleet, which would challenge Byzantine control of the western Mediterranean.{{sfn|Pryor|Jeffreys|2006|p=28}} Thus, from the early 8th century on, Muslim raids unfolded unceasingly against Byzantine holdings in the Western Mediterranean, especially Sicily.{{sfn|Nicolle|1996|p=47}}{{sfn|Pryor|Jeffreys|2006|p=33}} In addition, the new fleet would allow the Muslims to complete their conquest of the [[Maghreb]] and to [[Umayyad conquest of Hispania|successfully invade and capture]] most of the Visigoth-controlled Iberian Peninsula.{{sfn|Pryor|Jeffreys|2006|pp=29–30}}

====Byzantine counter-offensive====
{{details|topic=this period|Byzantine Empire under the Isaurian dynasty}}
[[File:Solidus-Leo III and Constantine V-sb1504.jpg|thumb|right|Emperor [[Leo III the Isaurian]] and his son and successor, [[Constantine V]]. Together, they spearheaded a revival of Byzantine fortunes against the Arabs, but also caused great internal strife because of their [[Byzantine Iconoclasm|iconoclastic policies]].]]

The Byzantines were unable to respond effectively to the Muslim advance in Africa because the two decades between 695 and 715 were a [[Twenty Years' Anarchy|period of great domestic turmoil]].{{sfn|Pryor|Jeffreys|2006|p=31}} They did react with raids of their own in the East, such as the one in 709 against Egypt which captured the local admiral,{{sfn|Pryor|Jeffreys|2006|p=33}} but they also were aware of a coming onslaught: as Caliph [[al-Walid I]] ({{reign|705|715}}) readied his forces for a renewed assault against Constantinople, Emperor [[Anastasios II (emperor)|Anastasios II]] ({{reign|713|715|show=none}}) prepared the capital, and mounted an unsuccessful pre-emptive strike against the Muslim naval preparations.{{sfn|Pryor|Jeffreys|2006|p=31}} Anastasios was soon overthrown by [[Theodosius III]] ({{reign|715|717|show=none}}), who in turn was replaced, just as the Muslim army was advancing through Anatolia, by [[Leo III the Isaurian]] ({{reign|717|741|show=none}}). It was Leo III who faced the second and final [[Siege of Constantinople (717–718)|Arab siege of Constantinople]]. The use of Greek fire, which devastated the Arab fleet, was again instrumental in the Byzantine victory, while a harsh winter and [[First Bulgarian Empire|Bulgar]] attacks further sapped the besiegers' strength.{{sfn|Pryor|Jeffreys|2006|pp=31–32}}

In the aftermath of the siege, the retreating remains of the Arab fleet were decimated in a storm, and Byzantine forces launched a counter-offensive, with a fleet sacking [[Latakia|Laodicea]] and an army driving the Arabs from Asia Minor.{{sfn|Norwich|1990|pp=352–353}}{{sfn|Treadgold|1997|p=349}} For the next three decades, naval warfare featured constant raids from both sides, with the Byzantines launching repeated attacks against the Muslim naval bases in Syria (Laodicea), and Egypt ([[Damietta]] and [[Tinnis]]).{{sfn|Pryor|Jeffreys|2006|p=33}} In 727, a revolt of the provincial [[theme (Byzantine district)|thematic]] fleets, largely motivated by resentment against the Emperor's iconoclasm, was put down by the imperial fleet through the use of Greek fire.{{sfn|Treadgold|1997|p=352}} Despite the losses this entailed, some 390&nbsp;warships were reportedly sent to attack Damietta in 739, and in 746 the Byzantines decisively defeated the Alexandrian fleet at [[Battle of Keramaia|Keramaia]] in Cyprus, breaking the naval power of the [[Umayyad Caliphate]].{{sfn|Pryor|Jeffreys|2006|p=33}}

The Byzantines followed this up with the destruction of the North African flotillas and coupled their successes at sea with severe trading limitations imposed on Muslim traders. Given the Empire's new ability to control the waterways, this strangled Muslim maritime trade.{{sfn|Lewis|Runyan|1985|p=29}} With the collapse of the Umayyad state shortly thereafter and the increasing fragmentation of the Muslim world, the Byzantine navy was left as the sole organized naval force in the Mediterranean.{{sfn|Pryor|Jeffreys|2006|p=33}} Thus, during the latter half of the 8th century, the Byzantines enjoyed a second period of complete naval superiority.{{sfn|Hocker|1995|p=91}} It is no coincidence that in the many [[Islamic eschatology|Islamic apocalyptic texts]] composed and transmitted during the first and second Islamic centuries, the [[Eschatology|End Times]] are preceded by a seaborne Byzantine invasion. Many traditions from the period stress that manning the guard posts ({{translit|ar|[[ribat]]}}) on the coasts of Syria is tantamount to partaking in the {{translit|ar|[[jihad]]}}, and authorities like [[Abu Hurayrah]] were cited as considering one day of {{translit|ar|ribat}} more pious an act than a night of prayer in the [[Kaaba]].{{sfn|Bashear|1991}}

These successes enabled Emperor [[Constantine V]] ({{reign|741|775|show=none}}) to shift the fleet from the Mediterranean to the Black Sea during his campaigns against the Bulgars in the 760s. In 763, a fleet of 800 ships carrying 9,600 cavalries and some infantry sailed to [[Pomorie|Anchialus]], where he scored a significant [[Battle of Anchialus (763)|victory]], but in 766, a second fleet, allegedly of 2,600 ships, again bound for Anchialus, sank ''en route''.{{sfn|Mango|2002|p=141}} At the same time, however, the [[Isaurian dynasty|Isaurian]] emperors undermined Byzantium's naval strength: with the Arab threat gone for the moment, and with the largely [[iconodule]] naval themes staunchly opposed to their [[Byzantine Iconoclasm|iconoclastic policies]], the emperors reduced the navy's size and downgraded the naval themes.{{sfn|Runciman|1975|p=150}}

====Renewed Muslim ascendancy====
[[File:Saracen fleet against Crete.jpg|thumb|right|upright=1.35|The Saracen pirate fleet sails towards Crete. From the [[John Skylitzes|Madrid Skylitzes manuscript]].]]

The Byzantine naval predominance lasted until the early 9th century when a succession of disasters at the hands of the resurgent Muslim fleets spelled its end and inaugurated an era that would represent the zenith of Muslim ascendancy.{{sfn|Christides|1981|p=76}}{{sfn|Pryor|Jeffreys|2006|p=41}} Already in 790, the Byzantines suffered a major defeat in the [[Gulf of Antalya]], and raids against Cyprus and Crete recommenced during the reign of [[Harun al-Rashid]] (786–809).{{sfn|Pryor|Jeffreys|2006|pp=41–42}} Around the Mediterranean, new powers were rising, foremost amongst them the [[Carolingian Empire]], while in 803, the {{lang|la|[[Pax Nicephori]]}} recognized the ''de facto'' independence of Byzantine [[Republic of Venice|Venice]], which was further entrenched by the repulsion of a Byzantine attack in 809.{{sfn|Pryor|Jeffreys|2006|p=45}} At the same time, in [[Ifriqiya]], the new [[Aghlabid]] dynasty was established, which immediately engaged in raids throughout the central Mediterranean.{{sfn|Pryor|Jeffreys|2006|p=45}}

The Byzantines, on the other hand, were weakened by a series of catastrophic defeats against the Bulgars, followed in 820 by the [[Revolt of Thomas the Slav]], which attracted the support of a large part of the Byzantine armed forces, including the thematic fleets.{{sfn|Pryor|Jeffreys|2006|pp=45–46}} Despite its suppression, the revolt had severely depleted the Empire's defences. As a result, [[Crete]] fell between 824 and 827 to a band of [[al-Andalus|Andalusian]] exiles. Three successive Byzantine recovery attempts failed over the next few years, and the island became a base for Muslim piratical activity in the Aegean, radically upsetting the balance of power in the region.{{sfn|Christides|1981|pp=76–106}}{{sfn|Pryor|Jeffreys|2006|pp=46–47}} Despite some Byzantine successes over the Cretan corsairs, and the [[Sack of Damietta (853)|razing]] of Damietta by a Byzantine fleet of 85 ships in 853,{{sfn|Pryor|Jeffreys|2006|p=47}} Arab naval power in the Levant was steadily reviving under Abbasid rule.{{sfn|Hocker|1995|p=92}} Further Byzantine attempts to recover Crete, in 843 and 866, were complete failures.{{sfn|Christides|1981|p=92}}

{{quote box
| width     = 260px
| align     = right
| bgcolor   = #c6dbf7
| title     =
| quote     = "During that time [...] the Muslims gained control over the whole Mediterranean. Their power and domination over it was vast. The Christian nations could do nothing against the Muslim fleets, anywhere in the Mediterranean. All the time, the Muslims rode its wave for conquest."
| source    = [[Ibn Khaldun]], ''[[Muqaddimah]]'', III.32{{sfn|Ibn Khaldūn|Rosenthal|1969|p=120}}
}}
The situation was even worse in the West. A critical blow was inflicted on the Empire in 827, as the Aghlabids began the slow [[Muslim conquest of Sicily|conquest of Sicily]], aided by the defection of the Byzantine commander [[Euphemius (Sicily)|Euphemios]] and the island's thematic fleet.{{sfn|Hocker|1995|p=92}}{{sfn|Pryor|Jeffreys|2006|p=48}} In 838, the Muslims crossed over into Italy, taking [[Taranto]] and [[Brindisi]], followed soon by [[Emirate of Bari|Bari]]. Venetian operations against them were unsuccessful, and throughout the 840s, the Arabs were freely raiding Italy and the Adriatic, even [[Arab raid against Rome|attacking Rome]] in 846.{{sfn|Pryor|Jeffreys|2006|p=48}} Attacks by the Lombards and [[Lothair I]] failed to dislodge the Muslims from Italy, while two large-scale Byzantine attempts to recover Sicily were heavily defeated in 840 and 859.{{sfn|Pryor|Jeffreys|2006|pp=48–49}} By 850, the Muslim fleets, together with large numbers of independent {{translit|ar|[[Ghazi warriors|ghazi]]}} raiders, had emerged as the major power of the Mediterranean, putting the Byzantines and the Christians in general on the defensive.{{sfn|Hocker|1995|p=92}}{{sfn|Pryor|1988|pp=102–105}}

The same period, when a battered Byzantium defended itself against enemies on all fronts, also saw the emergence of a new, unexpected threat: the [[Rus' (people)|Rus']] made their first appearance in Byzantine history with a [[Paphlagonian expedition of the Rus|raid against Paphlagonia]] in the 830s, followed by a [[Rus'–Byzantine War (860)|major expedition]] in 860.{{sfn|Lewis|Runyan|1985|p=30}}{{sfn|Pryor|Jeffreys|2006|p=60}}

===Byzantine Reconquest: the era of the Macedonian dynasty===
{{details|topic=this period|Byzantine Empire under the Macedonian dynasty}}

During the course of the later 9th and the 10th century, as the Caliphate fractured into smaller states and Arab power became weakened, the Byzantines launched a series of successful campaigns against them.{{sfn|Pryor|Jeffreys|2006|p=50}} This "Byzantine Reconquest" was overseen by the able sovereigns of the [[Macedonian dynasty]] (867–1056), and marked the noontide of the Byzantine state.{{sfn|Jenkins|1987|p=183}}{{sfn|Treadgold|1997|p=534}}

====Reign of Basil I====
[[File:Solidus-Basil I with Constantine and Eudoxia-sb1703.jpg|thumb|right|Gold {{lang|la|[[solidus (coin)|solidus]]}} of Emperor [[Basil I the Macedonian]]. His patronage of the fleet resulted in several successes and was long remembered by the sailors, forming strong ties of loyalty to the Macedonian dynasty that was felt up until the reign of his grandson, [[Constantine VII]].{{sfn|Jenkins|1987|p=192}}]]

The ascension of Emperor [[Basil I]] (867–886) heralded this revival, as he embarked on an aggressive foreign policy. Continuing the policies of his predecessor, [[Michael III]] (842–867), he showed great care to the fleet, and as a result, successive victories followed.{{sfn|Runciman|1975|p=151}} In 868, a fleet under the {{translit|grc|droungarios tou ploïmou}} [[Niketas Ooryphas]] relieved [[Ragusa (Croatia)|Ragusa]] from an [[Siege of Ragusa (866–868)|Arab siege]] and [[Dalmatia (theme)|re-established Byzantine presence]] in the area.{{sfn|MacCormick|2002|p=413}} A few years later, he twice heavily defeated the Cretan pirates at [[Battle of Kardia|Kardia]] and in the [[Battle of the Gulf of Corinth|Corinthian Gulf]],{{sfn|Treadgold|1997|p=457}}{{sfn|Pryor|Jeffreys|2006|p=61}} temporarily securing the Aegean.{{sfn|Hocker|1995|p=92}} Cyprus also was temporarily recovered and [[Bari]] occupied.{{sfn|Treadgold|1997|p=458}} At the same time, however, the Muslim presence in [[Cilicia]] was strengthened, and [[Tarsos]] became a major base for land and seaborne attacks against Byzantine territory, especially under the famed emir [[Yazaman al-Khadim]] (882–891), despite the [[Siege of Euripos|heavy defeat]] of one of his raids before [[Chalcis|Euripos]].{{sfn|Pryor|Jeffreys|2006|p=62}}

In the West, the Muslims continued to make steady advances, as the local Byzantine forces proved inadequate: the Empire was forced to rely on the aid of their nominal Italian subjects, and had to resort to the transfer of the eastern fleets to Italy to achieve any progress.{{sfn|Scafuri|2002|pp=49–50}} Following the fall of [[Enna]] in 855, the Byzantines were confined to the eastern shore of Sicily, and under increasing pressure. A relief expedition in 868 achieved little. [[Syracuse, Sicily|Syracuse]] was attacked again in 869, and in 870, [[Malta]] fell to the Aghlabids.{{sfn|Pryor|Jeffreys|2006|pp=64–65}} Muslim corsairs raided the Adriatic, and although they were driven out of [[Apulia]], in the early 880s they established bases along the western Italian coast, from where they would not be completely dislodged until 915.{{sfn|Pryor|Jeffreys|2006|pp=65, 68}} In 878, Syracuse, the main Byzantine stronghold in Sicily, was attacked again and fell, largely because the Imperial Fleet was occupied with transporting [[marble]] for the construction of the [[Nea Ekklesia]], Basil's new church.{{sfn|Treadgold|1998|p=33}} In 880, Ooryphas' successor, the {{translit|grc|droungarios}} [[Nasar]], scored a significant victory in a [[Battle of Cephalonia|night battle]] over the Aghlabids who were raiding the [[Ionian Islands]]. He then proceeded to raid Sicily, carrying off much booty, before [[Battle of Stelai|defeating]] another Muslim fleet off [[Punta Stilo]]. At the same time, another Byzantine squadron scored a significant victory at Naples.{{sfn|MacCormick|2002|p=955}}{{sfn|Pryor|Jeffreys|2006|pp=65–66}} These successes allowed a short-lived Byzantine counter-offensive to develop in the West in the 870s and 880s under [[Nikephoros Phokas the Elder]], expanding the Byzantine foothold in Apulia and [[Calabria]] and forming the theme of [[Longobardia]], which would later evolve into the [[Catepanate of Italy]]. A [[Battle of Milazzo (888)|heavy defeat]] off [[Milazzo]] in 888, however, signalled the virtual disappearance of major Byzantine naval activity in the seas around Italy for the next century.{{sfn|Hocker|1995|p=92}}{{sfn|Pryor|Jeffreys|2006|p=66}}

====Arab raids during the reign of Leo VI====
[[File:Sack of Thessalonica by Arabs, 904.png|thumb|right|upright=1.35|The sack of Thessalonica by the Arabs under Leo of Tripoli in 904, as depicted in the Madrid Skylitzes manuscript. It was the most serious of a renewed wave of piratical raids by the Muslim navies in the Aegean Sea during Leo VI's reign.]]

Despite the successes under Basil, during the reign of his successor [[Leo VI the Wise]] (886–912), the Empire again faced serious threats. In the north, a war broke out against the Bulgarian Tsar [[Simeon I of Bulgaria|Simeon]], and a part of the Imperial Fleet was used in 895 to ferry an army of [[Magyars]] across the Danube to [[Bulgarian-Hungarian Wars#Hungarian conquest (War of 894–896)|raid Bulgaria]].{{sfn|Treadgold|1997|pp=463–464}} The Bulgarian war produced several costly defeats, while at the same time the Arab naval threat reached new heights, with successive raids devastating the shores of Byzantium's naval heartland, the Aegean Sea. In 891 or 893, the Arab fleet sacked the island of [[Samos]] and took its {{translit|grc|[[strategos]]}} (military governor) prisoner, and in 898, the eunuch admiral Raghib carried off 3,000 Byzantine sailors of the [[Cibyrrhaeots]] as prisoners.{{sfn|Tougher|1997|pp=185–186}} These losses denuded Byzantine defences, opening the Aegean up to raids by the Syrian fleets.{{sfn|Pryor|Jeffreys|2006|p=62}} The first heavy blow came in 901, when the renegade [[Damian of Tarsus]] plundered [[Demetrias]], while in the next year, [[Taormina]], the Empire's last outpost in Sicily, [[Siege of Taormina (902)|fell to the Muslims]].{{sfn|Pryor|Jeffreys|2006|p=65}}{{sfn|Tougher|1997|pp=185–186}} The greatest disaster, however, came in 904, when another renegade, [[Leo of Tripoli]], raided the Aegean. His fleet penetrated even into the [[Dardanelles]], before proceeding to [[Sack of Thessalonica (904)|sack]] the Empire's second city, [[Thessaloniki|Thessalonica]], all while the Empire's fleet remained passive in the face of the Arabs' superior numbers.{{sfn|Tougher|1997|pp=186–188}} Furthermore, the Cretan corsairs' raids reached such intensity, that by the end of Leo's reign, most of the southern Aegean islands were either abandoned or forced to accept Muslim control and pay tribute to the pirates.{{sfn|Christides|1981|pp=82, 86–87}} It is no surprise that a defensive and cautious mindset was prevalent in Leo's contemporary instructions on naval warfare (''Naumachica'').{{sfn|Hocker|1995|p=92}}

The most distinguished Byzantine admiral of the period was [[Himerios (admiral)|Himerios]], the {{translit|grc|[[logothetes tou dromou]]}}. Appointed admiral in 904, he was unable to prevent the sack of Thessalonica, but he scored the first victory in 905 or 906, and in 910, he led a successful attack on Laodicea.{{sfn|Tougher|1997|p=191}}{{sfn|Christides|1981|pp=93–94}} The city was sacked and its hinterland plundered and ravaged without the loss of any ships.{{sfn|Norwich|1999|p=120}} A year later, however, a huge expedition of 112 dromons and 75 {{translit|grc|pamphyloi}} with 43,000 men, that had sailed under Himerios against the [[Emirate of Crete]], not only failed to recover the island,{{sfn|Treadgold|1997|pp=469–470}} but on its return voyage, it was ambushed and comprehensively defeated by Leo of Tripoli off Chios (October 912).{{sfn|Pryor|Jeffreys|2006|p=63}}{{sfn|Christides|1981|p=94}}

The tide began to turn again after 920. Coincidentally, the same year witnessed the ascension of an admiral, [[Romanos I|Romanos Lekapenos]] (920–944), to the imperial throne, for the second (after [[Tiberios III|Tiberios Apsimaros]]) and last time in the Empire's history. Finally, in 923, the decisive defeat of Leo of Tripoli off [[Lemnos]], coupled with the death of Damian during a siege of a Byzantine fortress in the next year, marked the beginning of the Byzantine resurgence.{{sfn|Pryor|Jeffreys|2006|p=64}}

====Recovery of Crete and the northern Levant====
[[File:Byzantines under Nikephoros Phokas besiege Chandax.png|thumb|right|upright=1.35|The siege of [[Heraklion|Chandax]], the main Muslim stronghold in Crete, as depicted in the ''Madrid Skylitzes'' manuscript. Nikephoros Phokas led a huge amphibious operation which recovered Crete for the Empire, thus securing the Aegean Sea from the Muslim pirate threat.]]

The Empire's growing might be displayed in 942, when Emperor Romanos I dispatched a squadron to the [[Tyrrhenian Sea]]. Using Greek fire, the squadron destroyed a fleet of Muslim corsairs from [[Fraxinetum]].{{sfn|Pryor|Jeffreys|2006|p=72}} In 949, however, another expedition of about 100 ships, launched by [[Constantine VII]] (945–959) against the Emirate of Crete, ended in disaster, due to the incompetence of its commander, [[Constantine Gongyles]].{{sfn|MacCormick|2002|p=414}}{{sfn|Pryor|Jeffreys|2006|p=71}} A renewed offensive in Italy in 951–952 was defeated by the [[Fatimids]], but another expedition in 956 and the loss of an Ifriqiyan fleet in a storm in 958 temporarily stabilized the situation in the peninsula.{{sfn|Pryor|Jeffreys|2006|p=72}} In 962, the Fatimids launched an assault on the remaining Byzantine strongholds on Sicily; Taormina fell on Christmas Day 962 and [[Rometta]] was besieged. In response, a major Byzantine expedition was launched in 964 but ended in disaster. The Fatimids defeated the Byzantine army before Rametta and then annihilated the fleet at the [[Battle of the Straits]], notably through the use of divers bearing incendiary devices. Both powers focusing their attention elsewhere, a truce was concluded between Byzantium and the Fatimids in 967, which curbed Byzantine naval activity in the West: the seas of Italy were left to the local Byzantine forces and the various Italian states until after 1025, when Byzantium again actively intervened in southern Italy and Sicily.{{sfn|Halm|1996|pp=404–405}}{{sfn|Pryor|Jeffreys|2006|pp=74–75}}

In the East, in 956 the {{translit|grc|strategos}} [[Basil Hexamilites]] inflicted a crushing defeat on the Tarsiot fleet, opening the way for another grand expedition to recover Crete.{{sfn|Pryor|Jeffreys|2006|p=72}} It was entrusted to [[Nikephoros II|Nikephoros Phokas]], who in 960 set out with a fleet of 100 dromons, 200 {{translit|grc|chelandia}}, and 308 transports, carrying an overall force of 77,000 men, to subdue the island.{{sfn|Treadgold|1997|p=495}} Although the navy ultimately had a limited combat role in the campaign, it was essential for keeping the sea-lanes open after a disastrous attack into the interior of the island required supplies to be brought in by sea.{{sfn|McMahon|2021|pp=63-79}} The conquest of Crete removed the direct threat to the Aegean, Byzantium's naval heartland, while Phokas' subsequent operations led to the recovery of Cilicia (in 963), Cyprus (in 968),{{sfn|Norwich|1999|p=195}} and the northern Syrian coast (in 969).{{sfn|Pryor|Jeffreys|2006|p=73}} These conquests removed the threat of the once mighty Muslim Syrian fleets, effectively re-establishing Byzantine dominance in the Eastern Mediterranean so that Nikephoros Phokas could boast to [[Liutprand of Cremona]] with the words "I alone command the sea".{{sfn|Runciman|1975|p=151}}{{sfn|Hocker|1995|p=93}} A few raids and naval clashes occurred as antagonism with the Fatimids mounted in the late 990s, but peaceful relations were restored soon after, and the Eastern Mediterranean remained relatively calm for several decades to come.{{sfn|Pryor|Jeffreys|2006|pp=75–76}}

During the same period, the Byzantine fleet was active in the Black Sea as well: a Rus' fleet that was [[Rus'–Byzantine War (941)|threatening Constantinople]] in 941 was destroyed by 15 hastily assembled old ships equipped with Greek fire, and the navy played an important role in the [[Rus'–Byzantine War (970–971)|Rus'–Byzantine War of 970–971]], when [[John I Tzimiskes]] (969–976) sent 300 ships to blockade the [[Kievan Rus']] from retreating over the Danube.{{sfn|Treadgold|1997|p=509}}

===Komnenian period===
{{details|topic=this period|Byzantine Empire under the Komnenos dynasty}}
====Decline during the 11th century====
{{quote box
| width     = 260px
| align     = right
| bgcolor   = #c6dbf7
| title     =
| quote     = "Strive at all time to have the fleet in top condition and to have it not want for anything. For the fleet is the glory of {{translit|grc|[[Roman Empire|Rhōmania]]}}. [...] The {{translit|grc|[[droungarios tou stolou|droungarios]]}} and {{translit|grc|[[protonotarios]]}} of the fleet should [...] investigate with rigor the slightest thing which is done to the fleet. For when the fleet is reduced to nothingness, you shall be overthrown and fall."
| source    = Admonitions to the Emperor, from the ''[[Strategikon of Kekaumenos|Strategikon]]'' of Kekaumenos, Ch. 87{{sfn|Kekaumenos|Tsoungarakis|1996|loc=''[[Strategikon of Kekaumenos|Strategikon]]'', Ch. 87}}
}}

Throughout most of the 11th century, the Byzantine navy faced few challenges. The Muslim threat had receded, as their navies declined and relations between the Fatimids, especially, and the Empire were largely peaceful. The last Arab raid against imperial territory was recorded in 1035 in the [[Cyclades]], and was defeated in the next year.{{sfn|Pryor|Jeffreys|2006|pp=87–88}} Another [[Rus'–Byzantine War (1043)|Rus' attack]] in 1043 was beaten back with ease, and with the exception of a short-lived attempt to recover Sicily under [[George Maniakes]], no major naval expeditions were undertaken either. Inevitably, this long period of peace and prosperity led to complacency and neglect of the military. Already in the reign of [[Basil II]] (976–1025), the defence of the Adriatic was entrusted to the Venetians. Under [[Constantine IX]] (1042–1055), both the army and navy were reduced as military service was increasingly commuted in favour of cash payments, resulting in an increased dependency upon foreign mercenaries.{{sfn|Pryor|Jeffreys|2006|pp=76–77, 89}}{{sfn|Haldon|1999|pp=90–91}} The large thematic fleets declined and were replaced by small squadrons subject to the local military commanders, geared more towards the suppression of piracy than towards confronting a major maritime foe.{{sfn|Pryor|Jeffreys|2006|p=88}}

By the last quarter of the 11th century, the Byzantine navy was a shadow of its former self, having declined through neglect, the incompetence of its officers, and lack of funds.{{sfn|Haldon|1999|p=91}} [[Kekaumenos]], writing in c. 1078, laments that "on the pretext of reasonable patrols, [the Byzantine ships] are doing nothing else but ferrying wheat, barley, pulse, cheese, wine, meat, olive oil, a great deal of money, and anything else" from the islands and coasts of the Aegean, while they "flee [the enemy] before they have even caught sight of them, and thus become an embarrassment to the Romans".{{sfn|Kekaumenos|Tsoungarakis|1996|loc=''[[Strategikon of Kekaumenos|Strategikon]]'', Ch. 87}} By the time Kekaumenos wrote, new and powerful adversaries had risen. In the West, the [[Normans|Norman]] [[Kingdom of Sicily]], which had expelled the Byzantines from Southern Italy and had conquered Sicily,{{sfn|Pryor|Jeffreys|2006|pp=91–93}} was now casting its eye on the Byzantine Adriatic coasts and beyond. In the East, the disastrous [[Battle of Manzikert]] in 1071 had resulted in the loss of Asia Minor, the Empire's military and economic heartland, to the [[Seljuk Turks]], who by 1081 had established their capital at [[İznik|Nicaea]], barely a hundred miles south of Constantinople.{{sfn|Pryor|Jeffreys|2006|p=94}} Soon after, Turkish as well as Christian pirates appeared in the Aegean. The Byzantine thematic fleets, which once policed the seas, were by then so depleted by neglect and the successive civil wars that they were incapable of responding effectively.{{sfn|Bréhier|2000|p=335}}

====Attempts at recovery under Alexios I and John II====
At this point, the sorry state of the Byzantine fleet had dire consequences. The Norman invasion could not be forestalled, and their army seized Corfu, landed unopposed in Epirus and [[Battle of Dyrrhachium (1081)|laid siege]] to [[Dyrrhachium]],{{sfn|Pryor|Jeffreys|2006|p=99}} starting a decade of war which consumed the scant resources of the embattled Empire.{{sfn|Birkenmeier|2002|p=39}} The new emperor, [[Alexios I Komnenos]] (1081–1118), was forced to call upon the assistance of the Venetians, who in the 1070s had already asserted their control of the Adriatic and Dalmatia against the Normans.{{sfn|Nicol|1988|pp=55–58}} In 1082, in exchange for their help, he granted them major trading concessions.{{sfn|Nicol|1988|pp=59–61}} This treaty, and subsequent extensions of these privileges, practically rendered the Byzantines hostage to the Venetians (and later also the Genoese and the Pisans). Historian John Birkenmeier notes that:

{{blockquote|Byzantium's lack of a navy [...] meant that Venice could regularly extort economic privileges, determine whether invaders, such as the Normans or Crusaders entered the Empire, and parry any Byzantine attempts to restrict Venetian commercial or naval activity.{{sfn|Birkenmeier|2002|p=39}}}}

In the clashes with the Normans through the 1080s, the only effective Byzantine naval force was a squadron commanded, and possibly maintained, by [[Michael Maurex]], a veteran naval commander of previous decades. Together with the Venetians, he initially prevailed over the Norman fleet, but the joint fleet was caught off guard and defeated by the Normans off Corfu in 1084.{{sfn|Pryor|Jeffreys|2006|p=100}}{{sfn|Nicol|1988|p=58}}

Alexios inevitably realized the importance of having his own fleet, and despite his preoccupation with land operations, he took steps to re-establish the navy's strength. His efforts bore some success, especially in countering the attempts by Turkish emirs like [[Chaka of Smyrna|Tzachas]] of Smyrna to launch fleets in the Aegean.{{sfn|Pryor|1988|p=113}}{{sfn|Haldon|1999|p=96}} The fleet under [[John Doukas (megas doux)|John Doukas]] was subsequently used to suppress revolts in Crete and Cyprus.{{sfn|Pryor|Jeffreys|2006|p=109}} With the aid of the [[First Crusade|Crusaders]], Alexios was able to regain the coasts of Western Anatolia and expand his influence eastwards: in 1104, a Byzantine squadron of 10 ships captured Laodicea and other coastal towns as far as [[Tripoli, Lebanon|Tripoli]].{{sfn|Nicolle|2005|p=69}} By 1118, Alexios was able to pass on a small navy to his successor, [[John II Komnenos]] (1118–1143).{{sfn|Pryor|Jeffreys|2006|p=111}} Like his father, John II concentrated on the army and regular land-based campaigns, but he took care to maintain the navy's strength and provisioning system.{{sfn|Haldon|1999|p=96}} In 1122, however, John refused to renew the trading privileges that Alexios had granted to the Venetians. In retaliation, the Venetians plundered several Byzantine islands, and, with the Byzantine fleet unable to confront them, John was forced to renew the treaty in 1125.{{sfn|Pryor|Jeffreys|2006|p=111}} Evidently, the Byzantine navy at this point was not sufficiently powerful for John to successfully confront Venice, especially since there were other pressing demands on the Empire's resources. Not long after this incident, John II, acting on the advice of his finance minister [[John of Poutza]], is reported to have cut funding to the fleet and transferred it to the army, equipping ships on an ''ad hoc'' basis only.{{sfn|Pryor|Jeffreys|2006|p=111}}{{sfn|Treadgold|1997|p=631}}

====Naval expeditions of Manuel I====
The navy enjoyed a major comeback under the ambitious emperor [[Manuel I Komnenos]] (1143–1180), who used it extensively as a powerful tool of foreign policy in his relations with the Latin and Muslim states of the Eastern Mediterranean.{{sfn|Treadgold|1997|p=641}} During the early years of his reign, the Byzantine naval forces were still weak: in 1147, the fleet of [[Roger II of Sicily]] under [[George of Antioch]] was able to raid Corfu, the [[Ionian islands]] and into the Aegean almost unopposed.{{sfn|Pryor|Jeffreys|2006|pp=106–107, 111–112}} In the next year, with Venetian aid, an army accompanied by a very large fleet (allegedly 500 warships and 1,000 transports) was sent to recapture Corfu and the Ionian Islands from the Normans. In retaliation, a Norman fleet of 40 ships reached Constantinople itself, demonstrating in the Bosporus off the [[Great Palace of Constantinople|Great Palace]] and raiding its suburbs.{{sfn|Norwich|1996|pp=98, 103}}{{sfn|Pryor|Jeffreys|2006|p=113}} On its return voyage however it was attacked and destroyed by a Byzantine or Venetian fleet.{{sfn|Pryor|Jeffreys|2006|p=113}}

In 1155, a Byzantine squadron of 10 ships in support of Norman rebel [[Robert III of Loritello]] arrived at [[Ancona]], launching the last Byzantine bid to regain Southern Italy. Despite initial successes and reinforcements under {{translit|grc|[[megas doux]]}} Alexios Komnenos Bryennios, the expedition was ultimately defeated in 1156, and 4 Byzantine ships were captured.{{sfn|Treadgold|1997|p=643}} By 1169, the efforts of Manuel had evidently borne fruit, as a large and purely Byzantine fleet of about 150 [[galley]]s, 10-12 large transports and 60 [[Horse transports in the Middle Ages|horse transports]] under {{translit|grc|megas doux}} [[Andronikos Kontostephanos]] was sent to [[Crusader invasions of Egypt|invade Egypt]] in cooperation with the ruler of the [[Crusader states|Crusader]] [[Kingdom of Jerusalem]].{{sfn|Phillips|2004|p=158}}{{sfn|Pryor|Jeffreys|2006|pp=112, 115}} The invasion failed, however, and the Byzantines lost half the fleet in a storm on the way back.{{sfn|Harris|2006|p=109}}

Following the Empire-wide seizure and imprisonment of all Venetians in March 1171, the Byzantine fleet was strong enough to [[Byzantine–Venetian war of 1171|deter an outright attack]] by the Venetians, who sailed to [[Chios]] and settled for negotiations. Manuel sent a fleet of 150 ships under Kontostephanos to confront them there and employed delaying tactics, until, weakened by disease, the Venetians began to withdraw and were pursued by Kontostephanos' fleet.{{sfn|Pryor|Jeffreys|2006|p=116}} It was a remarkable reversal of fortunes, compared with the humiliation of 1125. In 1177, another fleet of 70 galleys and 80 auxiliary ships under Kontostephanos, destined for Egypt, returned home after appearing off [[Acre (city)|Acre]], as Count [[Philip I, Count of Flanders|Philip of Flanders]] and many important nobles of the Kingdom of Jerusalem refused to participate in the campaign.{{sfn|Harris|2006|p=109}}{{sfn|Magdalino|2002|p=97}}{{sfn|Lilie|1994|p=215}} However, by the end of Manuel's reign, the strains of constant warfare on all fronts and the Emperor's various grandiose projects had become evident: the historian [[Niketas Choniates]] attributes the rise of piracy in the latter years of Manuel's reign to the diversion of the funds intended for the maintenance of the fleet for other needs of the imperial treasury.{{sfn|Birkenmeier|2002|p=22}}

===Decline===
====Angelos dynasty and the Fourth Crusade====
{{details|topic=this period|Byzantine Empire under the Angelos dynasty}}
After the death of Manuel I and the subsequent demise of the Komnenian dynasty in 1185, the navy declined swiftly. The maintenance of galleys and the upkeep of proficient crews were very expensive, and neglect led to a rapid deterioration of the fleet. Already by 1182 the Byzantines had to pay Venetian mercenaries to crew some of their galleys,{{sfn|Pryor|Jeffreys|2006|p=121}} but in the 1180s, as the bulk of the Komnenian naval establishment persisted, expeditions of 70–100 ships are still recorded in contemporary sources.{{sfn|Harris|2006|pp=128–130}} Thus Emperor [[Andronikos I Komnenos]] (1183–1185) could still gather 100 warships in 1185 to resist and later defeat a Norman fleet in the [[Sea of Marmara]].{{sfn|Norwich|1996|p=151}} However, the subsequent peace treaty included a clause that required the Normans to furnish a fleet for the Empire. This, together with a similar agreement made by [[Isaac II Angelos]] (1185–1195 and 1203–1204) with Venice the next year, in which the Republic would provide 40–100 galleys at six months' notice in exchange for favourable trading concessions, is a telling indication that the Byzantine government was aware of the inadequacy of its own naval establishment.{{sfn|Pryor|Jeffreys|2006|p=121}}

[[File:PriseDeConstantinople1204PalmaLeJeune.JPG|thumb|right|The [[Siege of Constantinople (1204)|fall of Constantinople]] to the Fourth Crusade marked the triumph of the Latin West, and especially the Venetian maritime power, over the enfeebled Byzantine Empire.]]

The period also saw the rise of piracy across the Eastern Mediterranean. The pirate activity was high in the Aegean, while pirate captains frequently offering themselves as mercenaries to one or the other of the region's powers, providing for the latter a quick and cheap way of raising a fleet for particular expeditions, without the costs of a standing navy. Thus a Byzantine fleet of 66 vessels sent by Isaac II to recapture Cyprus from [[Isaac Komnenos of Cyprus|Isaac Komnenos]] was destroyed by the pirate [[Margaritus of Brindisi]], who was in the employ of the Normans of Sicily.{{sfn|Ahrweiler|1966|pp=288–289}} The depredations of the pirates, especially the [[Republic of Genoa|Genoese]] captain Kaphoures, described by Niketas Choniates and his brother, the [[Metropolitan of Athens]] [[Michael Choniates]], finally forced the Angeloi to action. The fleet tax was once again levied from the coastal regions and a navy of 30 ships was equipped, which was entrusted to the Calabrian pirate [[Steiriones]]. Despite scoring a few early successes, Steiriones' fleet was destroyed in a surprise attack by Kaphoures off [[Sestos]]. A second fleet, augmented by Pisan vessels and again commanded by Steiriones, was finally able to defeat Kaphoures and end his raids.{{sfn|Ahrweiler|1966|pp=289–290}}

At the same time, however, the then {{translit|grc|megas doux}}, [[Michael Stryphnos]], was accused by Niketas Choniates of enriching himself by selling off the equipment of the imperial fleet,{{sfn|Pryor|Jeffreys|2006|p=121}}{{sfn|Ahrweiler|1966|pp=290–291}} while by the early 13th century the authority of the central government had weakened to such an extent that various local potentates began seizing power in the provinces.{{sfn|Ahrweiler|1966|pp=293–294}} The general atmosphere was one of lawlessness, which enabled men like [[Leo Sgouros]] in southern Greece and the imperial governor of Samos, [[Pegonites]], to use their ships for their own purposes, launching raids of their own. Even Emperor [[Alexios III Angelos]] (1195–1203) is said to have licensed one of his commanders, Constantine Phrangopoulos, to launch pirate raids against commerce in the Black Sea.{{sfn|Ahrweiler|1966|pp=291–292}}

The Byzantine state and its fleet were thus in no state to resist the naval might of Venice, which supported the [[Fourth Crusade]]. When Alexios III and Stryphnos were alerted to the fact that the Crusade was sailing for Constantinople, only 20 "wretched and decayed" vessels could be found, according to Niketas Choniates. During the [[Siege of Constantinople (1203)|first Crusader siege]] of the city in 1203, the attempts of the Byzantine ships to oppose the Crusader fleet from entering the [[Golden Horn]] were repulsed, and the Byzantine attempt to employ [[fireships]] failed due to the Venetians' skill at handling their ships.{{sfn|Ahrweiler|1966|pp=294–296}}

====Nicaea and the Palaiologan period====
{{details|topic=this period|Byzantine Empire under the Palaiologos dynasty}}

[[File:Michael VIII Palaiologos (head).jpg|thumb|right|Emperor Michael VIII Palaiologos. He restored the Byzantine Empire by recapturing Constantinople, and was responsible for the last flourishing of Byzantium as a major naval power.]]After the [[Siege of Constantinople (1204)|capture]] of Constantinople by the Fourth Crusade in 1204, the Byzantine Empire was [[Frangokratia|partitioned]] between the Crusaders, while three Greek successor states were set up, the [[Despotate of Epirus]], the [[Empire of Trebizond]], and the [[Empire of Nicaea]], each claiming the Byzantine imperial title. The former did not maintain a fleet, the Trapezuntine navy was minuscule and mostly used for patrols and transporting troops, while the Nicaeans initially followed a policy of consolidation and used their fleet for coastal defence.{{sfn|Macrides|2007|pp=168–169}}{{sfn|Bryer|1966|pp=4–5}} Under [[John III Vatatzes]] (1222–1254), a more energetic foreign policy was pursued, and in 1225, the Nicaean fleet was able to occupy the islands of [[Lesbos]], Chios, [[Samos]], and [[Icaria]].{{sfn|Nicol|1988|pp=166, 171}} It was, however, no match for the Venetians: attempting to [[Siege of Constantinople (1235)|blockade Constantinople]] in 1235, the Nicaean navy was defeated by a far smaller Venetian force, and in [[Battle of Constantinople (1241)|another similar attempt]] in 1241, the Nicaeans were again routed.{{sfn|Nicol|1988|pp=166, 171}} Nicaean efforts during the 1230s to support a local rebellion in Crete against Venice were also only partially successful, with the last Nicaean troops being forced to leave the island in 1236.{{sfn|Bartusis|1997|p=24}}{{sfn|Nicol|1988|pp=171–172}} Aware of the weakness of his navy, in March 1261 the Emperor [[Michael VIII Palaiologos]] (1259–1282) concluded the [[Treaty of Nymphaeum (1261)|Treaty of Nymphaeum]] with the Genoese, securing their aid against Venice at sea, in return for commercial privileges.{{sfn|Bartusis|1997|p=39}}{{sfn|Lane|1973|p=76}}

Following the recapture of Constantinople a few months later however, Michael VIII was able to focus his attention on building up his own fleet. In the early 1260s, the Byzantine navy was still weak and depended still greatly on Genoese aid. Even so, the allies were not able to stand up to Venice in a direct confrontation, as evidenced by the [[Battle of Settepozzi|defeat]] of a combined Byzantine–Genoese fleet of 48 ships by a much smaller Venetian fleet in 1263.{{sfn|Geanakoplos|1959|pp=127, 153–154}} Taking advantage of the Italians' preoccupation with the ongoing [[War of Saint Sabas|Venetian–Genoese war]],{{sfn|Lane|1973|p=76}} by 1270 Michael's efforts had produced a strong navy of 80 ships, with several Latin privateers sailing under imperial colours. In the same year, a fleet of 24 galleys besieged the town of [[Oreoi|Oreos]] in Negroponte ([[Euboea]]), and defeated a Latin fleet of 20 galleys.{{sfn|Bartusis|1997|p=59}} This marked the first successful independent Byzantine naval operation and the beginning of an organized naval campaign in the Aegean that would continue throughout the 1270s and would result in the recapture, albeit briefly, of many islands from the Latins.{{sfn|Nicol|1993|pp=59–60}}

This revival did not last long. Following the death of [[Charles of Anjou]] in 1285 and the end of the threat of an invasion from Italy, Michael's successor [[Andronikos II Palaiologos]] (1282–1328) assumed that, by relying on the naval strength of his Genoese allies, he could do without the maintenance of a fleet, whose particularly heavy expenditure the increasingly cash-strapped treasury could no longer afford. At the same time, Andronikos was less concerned with the West and more with affairs in Asia Minor and his—eventually futile—attempt to stop the Turkish advance there, a policy where the fleet lacked a role. Consequently, the entire fleet was disbanded, its crews dismissed and the ships are broken up or left to rot.{{sfn|Ahrweiler|1966|pp=374–376}}{{sfn|Laiou|1972|pp=74–76, 114}} The results were quick to follow: during Andronikos' long reign, the Turks gradually took permanent possession of the Aegean coasts of Anatolia, with the Empire unable to reverse the situation,{{sfn|Nicol|1988|p=246}}{{sfn|Nicol|1993|p=158}} while the Venetian fleet was able to attack Constantinople and raid its suburbs at will during the [[Byzantine–Venetian War (1296–1302)|1296–1302 war]].{{sfn|Laiou|1972|p=75}}{{sfn|Loenertz|1959|pp=158–167}}

Andronikos' decision aroused considerable opposition and criticism from contemporary scholars and officials almost from the outset, and historians like [[Pachymeres]] and [[Nikephoros Gregoras]] dwell long on the disastrous long-term effects of this short-sighted decision: piracy flourished, often augmented by the crews of the disbanded fleet who took service under Turkish and Latin masters, Constantinople was rendered defenceless towards the Italian maritime powers, and more and more Aegean islands fell under foreign rule—including Chios to the Genoese [[Benedetto I Zaccaria|Benedetto Zaccaria]], [[Hospitaller conquest of Rhodes|Rhodes and the Dodecanese]] to the [[Knights Hospitaller|Hospitallers]], Lesbos and other islands to the [[Gattilusi]]. As Gregoras commented, "if [the Byzantines] had remained masters of the seas, as they had been, then the Latins would not have grown so arrogant [...], nor would the Turks ever have gazed upon the sands of the [Aegean] sea, [...] nor would we have to pay to everyone tribute every year."{{sfn|Ahrweiler|1966|pp=375–378}}{{sfn|Angelov|2007|pp=175–176, 317}}{{sfn|Laiou|1972|p=115}} After 1305, bowing to popular pressure and the need to contain the [[Catalan Company]], the Emperor belatedly tried to rebuild the navy of 20 vessels, but although a few ships were built and a small fleet appears to have been active over the next couple of years, it eventually was disbanded again.{{sfn|Ahrweiler|1966|pp=380–381}}{{sfn|Laiou|1972|pp=164–166}}

In the 14th century, recurrent civil wars, attacks from Bulgaria and Serbia in the Balkans and the devastation caused by ever-increasing Turkish raids hastened the collapse of the Byzantine state, which would culminate in its final fall to the [[Ottoman Turks]] in 1453.{{sfn|Ahrweiler|1966|pp=381–382}} Several emperors after Andronikos II also tried to re-build a fleet, especially in order to secure the security and hence the independence of Constantinople itself from the interference of the Italian maritime powers, but their efforts produced only short-term results.{{sfn|Ahrweiler|1966|p=382}}

Thus Andronikos II's successor [[Andronikos III Palaiologos]] (1328–1341), immediately after his accession, with the help of contributions from various magnates, assembled a large fleet of reportedly 105 vessels. This he personally led in the last major foray of a Byzantine navy in the Aegean, recovering Chios and [[Phocaea]] from the Genoese and forcing various smaller Latin and Turkish principalities to come to terms with him.{{sfn|Ahrweiler|1966|p=383}}{{sfn|Nicol|1993|p=171}} His campaigns against the Ottomans in [[Bithynia]] were failures, however, and soon the Ottomans had established their first naval base at [[Trigleia]] on the Sea of Marmara, from where they raided the coasts of Thrace.{{sfn|Ahrweiler|1966|pp=383–384}} To defend against this new threat, towards the end of Andronikos III's reign a fleet of some 70 ships was built at Constantinople to oppose the Turkish raids, and headed by the {{translit|grc|megas doux}}, [[Alexios Apokaukos]].{{sfn|Ahrweiler|1966|p=384}} This fleet was very active during the [[Byzantine civil war of 1341–1347|civil war of 1341–1347]], in which its commander played a prominent role.{{sfn|Nicol|1993|p=199}}{{sfn|Bréhier|2000|p=341}} Following the civil war, Emperor [[John VI Kantakouzenos]] (1347–1354) tried to restore the navy and merchant fleet, as a means of both reducing the Empire's economic dependency on the Genoese colony of [[Galata]], which controlled the trade passing through Constantinople, and of securing the control of the Dardanelles against passage by the Turks.{{sfn|Ahrweiler|1966|p=385}}{{sfn|Nicol|1993|pp=220–221}} To that end, he enlisted the aid of the Venetians, but in March 1349, his newly built fleet of nine warships and about 100 smaller vessels were caught in a storm off the southern shore of Constantinople. The inexperienced crews panicked, and the ships were either [[Byzantine–Genoese War (1348–49)|sunk or captured]] by the Genoese.{{sfn|Ahrweiler|1966|p=385}}{{sfn|Bartusis|1997|pp=98–99}} Undeterred, Kantakouzenos launched another effort at building a fleet, which allowed him to re-establish Byzantine authority over Thessalonica and some coastal cities and islands. A core of this fleet was maintained at Constantinople, and although Byzantine ships remained active in the Aegean, and scored some successes over Turkish pirates, they were never able to stop their activities, let alone challenge the Italian navies for supremacy at sea.{{sfn|Ahrweiler|1966|pp=386–387}} Lack of funds condemned the fleet to a mere handful of vessels maintained at Constantinople.{{sfn|Ahrweiler|1966|p=382}} It is characteristic that in his 1418 pamphlet to the {{translit|grc|[[Despot (court title)|despotes]]}} [[Theodore II Palaiologos]], the scholar [[Gemistos Plethon]] advises against the maintenance of a navy, on the grounds that resources were insufficient to adequately maintain both it and an effective army.{{sfn|Bartusis|1997|p=219}}

Henceforth, the impoverished Byzantine state became a pawn of the great powers of the day, trying to survive by exploiting their rivalries.{{sfn|Ahrweiler|1966|pp=382, 387}} Thus in 1351, Kantakouzenos was induced to side with Venice in its [[War of the Straits|war with Genoa]], but the subsequent [[Battle of the Bosporus|battle]] ended in a carnage, and the Venetian admirals preferred to not risk another battle. Abandoned by his allies, Kantakouzenos was forced to sign an unfavourable peace.{{sfn|Nicol|1993|p=236}} During the brief usurpation of [[John VII Palaiologos|John VII]] in 1390, [[Manuel II Palaiologos|Manuel II]] (1391–1425) was able to gather only five galleys and four smaller vessels (including some from the Hospitallers of Rhodes) to recapture Constantinople and rescue his father [[John V Palaiologos|John V]].{{sfn|Bartusis|1997|p=110}} Six years later, Manuel promised to arm ten ships to assist the [[Crusade of Nicopolis]];{{sfn|Heath|1984|p=23}} twenty years later, he personally commanded 4 galleys and 2 other vessels carrying some infantry and cavalry, and saved the island of [[Thasos]] from an invasion.{{sfn|Norwich|1996|pp=376–377}} Byzantine ships were active throughout the [[Ottoman Interregnum]], when Byzantium sided with various rival Ottoman princes in turn. Manuel used his ships to ferry the rival pretenders and their forces across the Straits.{{sfn|Kastritsis|2007|pp=138, 146–147, 188}} With Genoese assistance, Manuel's fleet was also able to muster a fleet of eight galleys and capture Gallipoli in May 1410, albeit for a brief time;{{sfn|Kastritsis|2007|pp=146–147}} and in August 1411, the Byzantine fleet was instrumental in the failure of a siege of Constantinople by the Ottoman prince [[Musa Çelebi]], when it defeated Musa's attempt to blockade the city by sea as well.{{sfn|Kastritsis|2007|p=169}} Likewise, in 1421, 10 Byzantine warships were engaged in support of the Ottoman pretender Mustafa against Sultan [[Murad II]].{{sfn|Heath|1984|p=23}}

The last recorded Byzantine naval victory occurred in 1427 in a [[Battle of the Echinades (1427)|battle]] off the [[Echinades]] Islands, when the Emperor [[John VIII Palaiologos]] (1425–1448) defeated the superior fleet of [[Carlo I Tocco]], [[County palatine of Cephalonia and Zakynthos|Count of Cephalonia]] and [[Despotate of Epirus|Despot of Epirus]], forcing him to relinquish all his holdings in the Morea to the Byzantines.{{sfn|Setton|1978|pp=18–19}} The last appearance of the Byzantine navy was in the final Ottoman siege of 1453, when a mixed fleet of Byzantine, Genoese and Venetian ships (varying numbers are provided by the sources, ranging from 10 to 39 vessels) defended Constantinople against the Ottoman fleet.{{sfn|Nicolle|2005|p=45}}{{sfn|Bartusis|1997|p=132}} During the siege, on 20 April 1453, the last naval engagement in Byzantine history took place when three Genoese galleys escorting a Byzantine transport fought their way through the huge Ottoman blockade fleet and into the Golden Horn.{{sfn|Nicolle|2005|pp=53–56}}

==Organization==

===Early period (4th – mid-7th centuries)===
Very little is known about the organization of the Roman fleets of late Antiquity, from the gradual break-up of the large provincial fleets into smaller squadrons in the 3rd century to the formation of a new navy at the onset of the Muslim conquests. Despite the evidence of considerable naval activity in this period, earlier scholars believed that the Roman navy had all but vanished by the 4th century, but more recent work has altered this picture towards a transformation into a mainly fluvial and coastal force, designed for close co-operation with the army.{{sfn|Cosentino|2008|pp=578–583}}

Under Emperor [[Diocletian]] (284–305), the navy's strength reportedly increased from 46,000 men to 64,000 men,{{sfn|Treadgold|1997|p=19}} a figure that represents the numerical peak of the late Roman navy. The [[Danube]] Fleet (''Classis Histrica'') with its attendant legionary flotillas is still well attested in the ''[[Notitia Dignitatum]]'', and its increased activity is commented upon by [[Vegetius]] (''[[De Re Militari]]'', IV.46). In the West, several fluvial fleets are mentioned, but the old standing praetorian fleets had all but vanished (''De Re Militari'', IV.31) and even the remaining western provincial fleets appear to have been seriously understrength and incapable of countering any significant barbarian attack.{{sfn|Lewis|Runyan|1985|pp=4–8}} In the East, the Syrian and Alexandrian fleets are known from legal sources to have still existed in c. 400 (''[[Codex Justinianus]]'', [https://web.archive.org/web/20120216011218/http://webu2.upmf-grenoble.fr/Haiti/Cours/Ak/Corpus/CJ11.htm#2 XI.2.4] & [https://web.archive.org/web/20120216011218/http://webu2.upmf-grenoble.fr/Haiti/Cours/Ak/Corpus/CJ11.htm#13 XI.13.1]), while a fleet is known to have been stationed at Constantinople itself, perhaps created out of the remnants of the praetorian fleets.{{sfn|Casson|1991|p=213}} In 400 it was sufficient to slaughter a large number of [[Goths]] who had built rafts and tried to cross the strip of sea that separates Asia from Europe.{{sfn|Ward-Perkins|2005|p=60}} Its size, however, is unknown, and it does not appear in the ''Notitia''.{{sfn|MacGeorge|2002|p=307}}

For operations in the Mediterranean during the 5th century, fleets appear to have been assembled on an ''ad hoc'' basis and then disbanded.{{sfn|Hocker|1995|p=90}} The first permanent Byzantine fleet can be traced to the early 6th century and the revolt of Vitalian in 513–515, when Anastasius I created a fleet to counter the rebels' own.{{sfn|Hocker|1995|p=90}} This fleet was retained and under Justinian I and his successors it was developed into a professional and well-maintained force.{{sfn|Hocker|1995|p=91}} Because of the absence of any naval threat, however, the navy of the late 6th century was relatively small, with several small flotillas in the Danube and two main fleets maintained at Ravenna and Constantinople.{{sfn|Haldon|1999|p=68}} Additional flotillas must have been stationed at the other great maritime and commercial centres of the Empire: at Alexandria, providing the escort to the annual grain fleet to Constantinople, and at Carthage, controlling the western Mediterranean. Justinian also stationed troops and ships at the more remote outposts of the Empire, at Septem ([[Ceuta]]), [[Chersonesus Taurica|Cherson]] in the [[Crimea]], and Aelana ([[Eilat]]) in the [[Gulf of Aqaba]].{{sfn|Lewis|Runyan|1985|pp=20–22}}{{sfn|Bréhier|2000|pp=324–325}}{{sfn|Cosentino|2008|p=580}} The long-established naval tradition and infrastructure of those areas made the maintenance of the fleet easier, and, in the event of a naval expedition, a large fleet could be quickly and inexpensively assembled by impressing the numerous merchant vessels.{{sfn|Lewis|Runyan|1985|p=22}}

===Middle period (late 7th century – 1070s)===
====Fleet organization====
[[File:Droysen - Oströmisches Reich.jpg|thumb|right|upright=2|The Byzantine Empire between the 6th and late 9th centuries, including the themes as of {{circa|900}}. The scattered and isolated imperial possessions around the Mediterranean were defended and reinforced by the Byzantine fleets.]]

In response to the Arab conquests during the 7th century, the whole administrative and military system of the Empire was reformed, and the [[Theme system|thematic system]] established. According to this, the Empire was divided into several themes ({{langx|grc|θέματα|themata}}, sing. {{lang|grc|θέμα}}, {{translit|grc|thema}}), which were regional civil and military administrations. Under the command of a {{translit|grc|[[strategos]]}}, each theme maintained its own, locally levied forces. Following a series of revolts by thematic forces, under Constantine V the larger early themes were progressively broken up, while a central imperial army, the {{translit|grc|[[tagma (military)|tagmata]]}}, was created, stationed at or near Constantinople, serving as a central reserve that henceforth formed the core of campaigning armies.{{sfn|Treadgold|1998|p=28}}{{sfn|Haldon|1999|p=78}}

=====Rise and fall of the {{translit|grc|Karabisianoi}}=====
A similar process was followed in the fleet, which was organized along similar lines. In the second half of the 7th century, the fleet of the {{translit|grc|[[Karabisianoi]]}} ({{langx|grc|Καραβισιάνοι||the Ships' Men}}) was created.{{sfn|Ahrweiler|1966|p=22}} The exact date is unknown, with suggestions ranging from the 650s/660s, in response to the Battle of the Masts,{{sfn|Pryor|Jeffreys|2006|p=25}}{{sfn|Treadgold|1997|pp=315, 382}}{{sfn|Cosentino|2008|p=602}} or following the first Arab siege of Constantinople in 672–678.{{sfn|Ahrweiler|1966|pp=22–23}} Its origin is also unknown: it was recruited possibly from the remainders of the old {{lang|la|[[quaestura exercitus]]}},{{sfn|Haldon|1999|p=74}} or the army of the [[Praetorian prefecture of Illyricum|Illyricum]].{{sfn|Treadgold|1998|p=73}} It was headed by a {{translit|grc|strategos}} ({{translit|grc|strategos ton karabon/karabisianon}}, {{lit.|general of the ships/seafarers}}),{{sfn|Ahrweiler|1966|pp=24–25}} and included the southern coast of Asia Minor from [[Miletus]] to the frontier with the [[Caliphate]] near [[Silifke|Seleucia]] in Cilicia, the Aegean islands and the imperial holdings in southern Greece. Its headquarters was initially perhaps at Samos, with a subordinate command under a {{translit|grc|droungarios}} at Cibyrrha in [[Pamphylia]]. As its name suggests, it comprised most of the Empire's standing navy, and faced the principal maritime threat, the Arab fleets of Egypt and Syria.{{sfn|Hocker|1995|p=93}}{{sfn|Haldon|1999|p=74}}

The {{translit|grc|Karabisianoi}} however proved inadequate and were replaced in the early 8th century by a more complex system composed of three elements, which with minor alterations survived until the 11th century: a central imperial fleet based at Constantinople, a small number of large regional naval commands, either naval themes or independent commands termed "droungariates", and a greater number of local squadrons charged with purely defensive and police tasks and subordinate to the local provincial governors.{{sfn|Ahrweiler|1966|pp=31–35}} Unlike the earlier Roman navy, where the provincial fleets were decidedly inferior in numbers and included only lighter vessels than the central fleets, the Byzantine regional fleets were probably formidable formations in their own right.{{sfn|Hocker|1995|p=99}}

=====The Imperial Fleet=====
The capital's navy had played a central role in the repulsion of the Arab sieges of Constantinople,{{sfn|Haldon|1999|p=74}} but the exact date of the establishment of the Imperial Fleet ({{lang|grc|βασιλικὸς στόλος}}, {{translit|grc|basilikos stolos}}, or {{lang|grc|βασιλικὸν πλόϊμον}}, {{translit|grc|basilikon ploïmon}}) as a distinct command is unclear. The Irish historian [[J. B. Bury]], followed by the French Byzantinist [[Rodolphe Guilland]], considered it "not improbable" that the Imperial Fleet existed as a subordinate command under the {{translit|grc|strategos ton karabisianon}} already in the 7th century.{{sfn|Guilland|1967|p=535}}{{sfn|Bury|1911|p=109}} On the other hand, the [[Droungarios of the Fleet|{{translit|grc|droungarios}} of the Imperial Fleet]] first appears in the ''[[Taktikon Uspensky]]'' of {{circa|842/3}};{{sfn|Bury|1911|p=109}} and as there is little evidence for major fleets operating from Constantinople during the 8th century, the Greek Byzantinist [[Hélène Ahrweiler]] dated the fleet's creation to the early 9th century.{{sfn|Ahrweiler|1966|pp=73–74}} From that point on, the Imperial Fleet formed the main naval reserve force and provided the core of various expeditionary fleets.{{sfn|Ahrweiler|1966|pp=33–34}}

=====Maritime themes=====
The first and for a long time only maritime theme ({{lang|grc|θέμα ναυτικόν}}, {{translit|grc|thema nautikon}}) was the [[Cibyrrhaeot Theme|Theme of the Cibyrrhaeots]] ({{lang|grc|θέμα Κιβυρραιωτῶν}}, {{translit|grc|thema Kibyrrhaioton}}). It was created from the {{translit|grc|Karabisianoi}} fleet, and assigned to the administration and defence of the southern coasts of Asia Minor.{{sfn|Ahrweiler|1966|pp=50–51}}{{sfn|Haldon|1999|p=77}} The exact date of its creation is unclear, with one view proposing {{circa|719}}{{sfn|Ahrweiler|1966|pp=26–31}}{{sfn|Pryor|Jeffreys|2006|p=32}} and another {{circa|727|lk=no}}.{{sfn|Treadgold|1997|p=352}} Its {{translit|grc|strategos}}, first mentioned in 734, was based at [[Antalya|Attaleia]].{{sfn|Ahrweiler|1966|p=82}}{{sfn|Kazhdan|1991|p=1127}} His principal lieutenants were the {{translit|grc|[[katepano]]}} (head commander) of the Mardaites, an {{translit|grc|[[ek prosopou]]}} (deputy commander) at [[Syllaeum]] and {{translit|grc|droungarioi}} of Attaleia and [[Kos]].{{sfn|Kazhdan|1991|p=1127}}{{sfn|Ahrweiler|1966|pp=82–83}} Being located closest to the Muslim Levant, it remained the Empire's principal naval fleet for centuries,{{sfn|Hocker|1995|p=93}} until it was reduced with the decline of the Arab naval threat. The fleet is last mentioned in 1043, and thereafter the theme became a purely civilian province.{{sfn|Kazhdan|1991|p=1127}}

The Cibyrrhaeots were complemented by two independent naval commands in the Aegean, each headed by a {{translit|grc|droungarios}}: the {{translit|grc|Aigaion Pelagos}} ('Aegean Sea'), covering the northern half of the Aegean and the Dardanelles and [[Marmara Sea]],{{sfn|Ahrweiler|1966|pp=76–79}} and the command variously known as the {{translit|grc|Dodekanesos}} ('Twelve Islands') and {{translit|grc|Kolpos}} ('Gulf'), which was based at Samos and comprised the southern Aegean including the Cyclades.{{sfn|Ahrweiler|1966|pp=79–81}} Unlike the other {{translit|grc|droungarioi}}, who headed subordinate commands, these two circumscriptions were completely independent, and their {{translit|grc|droungarioi}} exercised both civil and military authority over them.{{sfn|Ahrweiler|1966|pp=64–65}} Eventually, they were raised to full maritime themes, the [[Aegean Sea (theme)|Theme of the Aegean Sea]] ({{lang|grc|θέμα τοῦ Αἰγαίου Πελάγους}}, {{translit|grc|thema tou Aigaiou Pelagous}}) in {{circa|843|lk=no}},{{sfn|Pryor|Jeffreys|2006|p=47}}{{sfn|Treadgold|1998|p=76}} while the eastern parts of the {{translit|grc|Dodekanesos}}/{{translit|grc|Kolpos}} droungariate formed the [[Samos (theme)|Theme of Samos]] ({{lang|grc|θέμα Σάμου}}, {{translit|grc|thema Samou}}) in the late 9th century. It comprised it the [[Ionia]]n coast, and its capital was at [[Smyrna]].{{sfn|Ahrweiler|1966|pp=79–81}}{{sfn|Kazhdan|1991|p=1836}}

=====Local squadrons=====
Some of the other, 'land' themes also maintained sizeable squadrons, usually placed under a {{translit|grc|[[tourmarches]]}} (mentioned collectively as {{translit|grc|tourmarchai ton ploïmaton}} in the ''Taktikon Uspensky''). They played an intermediate role between the large thematic fleets and the central Imperial Fleet: they were permanent squadrons with professional crews ({{translit|grc|taxatoi}}), maintained by resources from the imperial treasury and not the province they were stationed in, but subordinate to the local thematic {{translit|grc|strategos}} and charged mainly with local defence and police duties.{{sfn|Ahrweiler|1966|pp=83–85}} These were:
* The [[Theme of Hellas]] ({{lang|grc|θέμα Ἑλλάδος}}, {{translit|grc|thema Hellados}}), founded in {{circa|686–689}} by Justinian II, it encompassed the imperial possessions of southern [[Greece]] with capital at [[Corinth]]. Justinian settled 6,500 Mardaites there, who provided oarsmen and garrisons.{{sfn|Treadgold|1997|p=383}} While not exclusively a naval theme, it maintained its own fleet. It was split in 809 into the [[Theme of the Peloponnese]] and the new Theme of Hellas, covering [[Central Greece (geographic region)|Central Greece]] and [[Thessaly]], which also retained smaller fleets.{{sfn|Haldon|1999|p=77}}{{sfn|Treadgold|1997|p=427}}
* The [[Sicily (theme)|Theme of Sicily]] ({{lang|grc|θέμα Σικελίας}}, {{translit|grc|thema Sikelias}}) was responsible for [[Sicily]] and the imperial possessions in south-western Italy ([[Calabria]]). Once the bastion of Byzantine naval strength in the West, by the late 9th century it had greatly diminished in strength and disappeared after the final loss of Taormina in 902.{{sfn|Hocker|1995|p=93}} Distinct {{translit|grc|tourmarchai}} are attested for Sicily proper and Calabria.{{sfn|Ahrweiler|1966|pp=83ff.}}
* The [[Theme of Cephallenia]] ({{lang|grc|θέμα Κεφαλληνίας}}, {{translit|grc|thema Kephallenias}}), controlling the [[Ionian Islands]], was established in the mid- to late 8th century, to protect imperial communications with Italy and defend the [[Ionian Sea]] from Arab raids. The new imperial possessions in [[Apulia]] were added to it in the 870s, before they were made into a separate theme (that of [[Longobardia]]) in about 910.{{sfn|Kazhdan|1991|pp=1122, 1250}}
* The [[Paphlagonia (theme)|Theme of Paphlagonia]] ({{lang|grc|θέμα Παφλαγονίας}}, {{translit|grc|thema Paphlagonias}}) and the [[Chaldia|Theme of Chaldia]] ({{lang|grc|θέμα Χαλδίας}}, {{translit|grc|thema Chaldias}}) were split off from the [[Armeniac Theme]] in {{circa|819|lk=no}} by Emperor [[Leo V the Armenian|Leo V]] and provided with their own naval squadrons, possibly as a defence against Rus' raids.{{sfn|Treadgold|1997|p=433}}

Isolated regions of particular importance for the control of the major sea-lanes were covered by separate officials with the title of {{translit|grc|[[archon]]}}, who in some cases may have commanded detachments of the Imperial Fleet. Such {{translit|grc|archontes}} are known for Chios, Malta, the [[Euboic Gulf]], and possibly [[Vagenetia]] and "Bulgaria" (whose area of control is identified by Ahrweiler with the mouths of the Danube).{{sfn|Ahrweiler|1966|pp=85–89}} These vanished by the end of the 9th century, either succumbing to Arab attacks or being reformed or incorporated into themes.{{sfn|Ahrweiler|1966|pp=95–96}}

====Manpower and size====
Just as with its land counterpart, the exact size of the Byzantine navy and its units is a matter of considerable debate, owing to the scantness and ambiguous nature of the primary sources. One exceptions are the numbers for the late 9th and early 10th century, for which we possess a more detailed breakdown, dated to the Cretan expedition of 911. These lists reveal that during the reign of Leo VI the Wise, the navy reached 34,200 oarsmen and perhaps as many as 8,000 marines.{{sfn|Treadgold|1998|p=67}} The central Imperial Fleet totalled some 19,600 oarsmen and 4,000 marines under the command of the {{translit|grc|droungarios}} of the Imperial Fleet. These four thousand marines were professional soldiers, first recruited as a corps by Basil I in the 870s. They were a great asset to the Imperial Fleet, for whereas previously it had depended on thematic and tagmatic soldiers for its marines, the new force provided a more reliable, better trained and immediately available force at the Emperor's disposal.{{sfn|Treadgold|1997|p=457}} The high status of these marines is illustrated by the fact that they were considered to belong to the imperial {{translit|grc|tagmata}}, and were organized along similar lines.{{sfn|Treadgold|1998|pp=104–105}} The Aegean thematic fleet numbered 2,610 oarsmen and 400 marines, the Cibyrrhaeot fleet stood at 5,710 oarsmen and 1,000 marines, the Samian fleet at 3,980 oarsmen and 600 marines, and finally, the Theme of Hellas furnished 2,300 oarsmen with a portion of its 2,000 thematic soldiers doubling as marines.{{sfn|Treadgold|1998|p=67}}

The following table contains estimates, by Warren T. Treadgold, of the number of oarsmen over the entire history of the Byzantine navy:

{| class="wikitable" style="text-align:center; margin: 1em auto 1em auto"
|-
! Year !! 300 !! 457 !! 518 !! 540 !! 775 !! 842 !! 959 !! 1025 !! 1321
|-
! Rowers
| 32,000{{sfn|Treadgold|1997|p=145}} || 32,000{{sfn|Treadgold|1997|p=145}} || 30,000{{sfn|Treadgold|1997|p=277}} || 30,000{{sfn|Treadgold|1997|p=277}} || 18,500{{sfn|Treadgold|1997|p=412}} || 14,600{{sfn|Treadgold|1997|p=576}} || 34,200{{sfn|Treadgold|1997|p=576}} || 34,200{{sfn|Treadgold|1997|p=576}} || 3,080{{sfn|Treadgold|1997|p=843}}
|}

Contrary to popular perception, [[galley slave]]s were not used as oarsmen, either by the Byzantines or the Arabs, or by their Roman and Greek predecessors.{{sfn|Casson|1991|p=188}} Throughout the existence of the Empire, Byzantine crews consisted of mostly lower-class freeborn men, who were professional soldiers, legally obliged to perform military service ({{translit|grc|[[strateia]]}}) in return for pay or land estates. In the first half of the 10th century, the latter were calculated to be of the value of {{convert|2|-|3|lb|kg}} of gold for sailors and marines.{{sfn|Pryor|1988|p=76}}{{sfn|Haldon|1999|p=267}} Use was however made of prisoners of war and foreigners as well. Alongside the Mardaites, who formed a significant part of the fleet's crews, an enigmatic group known as the {{translit|grc|Toulmatzoi}} (possibly Dalmatians) appears in the Cretan expeditions, as well as many Rus', who were given the right to serve in the Byzantine armed forces in a series of 10th-century [[Rus'–Byzantine Treaty (disambiguation)|treaties]].{{sfn|Makrypoulias|1995|pp=154, 159}}{{sfn|Bréhier|2000|pp=330–331}}

In his ''[[De Ceremoniis]]'', [[Constantine Porphyrogennetos]] gives the fleet lists for the expeditions against Crete of 911 and 949. These references have sparked a considerable debate as to their interpretation: thus the numbers given for the entire Imperial Fleet in 949 can be interpreted as either 100, 150 or 250 ships, depending on the reading of the Greek text. The precise meaning of the term {{translit|grc|ousia}} ({{lang|grc|οὺσία}}) is also a subject of confusion: traditionally, it is held to have been a standard complement of 108 men, and that more than one could be present aboard a single ship. In the context of the ''De Ceremoniis'' however, it can also be read simply as "unit" or "ship".{{sfn|MacCormick|2002|pp=413–414}}{{sfn|Makrypoulias|1995|pp=154–155}} The number of 150 seems more compatible with the numbers recorded elsewhere, and is accepted by most scholars, although they differ as to the composition of the fleet. Makrypoulias interprets the number as 8 {{translit|grc|pamphyloi}}, 100 {{translit|grc|ousiakoi}} and 42 {{translit|grc|dromones}} proper, the latter including the two imperial vessels and the ten ships of the {{translit|grc|Stenon}} squadron.{{sfn|Makrypoulias|1995|pp=154–156}}{{sfn|Treadgold|1998|p=85}} As for the total size of the Byzantine navy in this period, Warren Treadgold extrapolates a total, including the naval themes, of {{circa|240}} warships, a number which was increased to 307 for the Cretan expedition of 960–961. According to Treadgold, the latter number probably represents the approximate standing strength of the entire Byzantine navy (including the smaller flotillas) in the 9th and 10th centuries.{{sfn|Treadgold|1998|p=85}} It is however noteworthy that a significant drop in the numbers of ships and men attached to the thematic fleets is evident between 911 and 949. This drop, which reduced the size of thematic fleets from a third to a quarter of the total navy, was partly due to the increased use of the lighter {{translit|grc|ousiakos}} type instead of the heavier {{translit|grc|dromon}} proper, and partly due to financial and manpower difficulties. It is also indicative of a general trend that would lead to the complete disappearance of the provincial fleets by the late 11th century.{{sfn|Makrypoulias|1995|pp=157–158}}

====Rank structure====
Although naval themes were organized much the same way as their land counterparts, there is some confusion in the Byzantine sources as to the exact rank structure.{{sfn|Pryor|Jeffreys|2006|p=266}} The usual term for admiral was {{translit|grc|strategos}}, the same term used for the generals that governed the land themes. Under the {{translit|grc|strategos}} were two or three {{translit|grc|tourmarchai}} (sing. {{translit|grc|tourmarches}}, effectively 'vice admiral'), in turn overseeing a number of {{translit|grc|droungarioi}} (sing. {{translit|grc|droungarios}}, corresponding to 'rear admiral').{{sfn|Pryor|Jeffreys|2006|p=267}} Until the mid-9th century, the governors of the themes of the Aegean and Samos are also recorded as {{translit|grc|droungarioi}}, since their commands were split off from the original {{translit|grc|Karabisianoi}} fleet, but they were then raised to the rank of {{translit|grc|strategos}}.{{sfn|Pryor|Jeffreys|2006|p=267}} As the thematic admirals also doubled as governors of their themes, they were assisted by a {{translit|grc|protonotarios}} (chief secretary) who headed the civilian administration of the theme. Further staff officers were the {{translit|grc|chartoularios}} in charge of the fleet administration, the {{translit|grc|[[protomandator]]}} (chief messenger), who acted as chief of staff, and a number of staff {{translit|grc|kometes}} ('counts', sing. {{translit|grc|komes}}), including a {{translit|grc|komes tes hetaireias}}, who commanded the bodyguard ({{translit|grc|[[hetaireia]]}}) of the admiral.{{sfn|Treadgold|1998|p=104}}

[[File:Seal of Niketas, commander of the Imperial Fleet.jpg|thumb|right|alt=Lead seal with cross surrounded by legend on the obverse and a simple legend in the reverse|Seal of Niketas, {{translit|grc|[[magistros]]}}, {{translit|grc|[[droungarios]]}} and {{translit|grc|[[katepano]]}} of the {{translit|grc|basilikon ploïmon}} (late 9th century)]]
The Imperial Fleet was a different case, as it was not tied to the thematic administration, but was considered as one of the {{translit|grc|tagmata}}, the professional central reserve forces.{{sfn|Ahrweiler|1966|p=70}} Consequently, the commander of the Imperial Fleet remained known as the {{translit|grc|droungarios tou basilikou ploïmou}} (later with the prefix {{translit|grc|megas}}, 'grand').{{sfn|Haldon|1999|p=119}} Originally very lowly ranked, the office rose quickly in the hierarchy: by 899 he was placed immediately before or after the {{translit|grc|[[logothetes tou dromou]]}}, and ahead of various senior military and civil officials. He was also notable in not being classed with the other military commanders, whether of the themes or of the {{translit|grc|tagmata}}, but in the special class of military officials, the {{translit|grc|[[stratarchai]]}}, where he is listed second after the {{translit|grc|[[hetaireiarches]]}}, the commander of the imperial bodyguard.{{sfn|Bury|1911|pp=108–110, 137, 140}}{{sfn|Guilland|1967|pp=535–536}} His title is still found in the Komnenian era, albeit as commander of the imperial escort squadron, and survived until the Palaiologan era, being listed in the 14th-century ''Book of Offices'' of [[George Kodinos|Pseudo-Kodinos]].{{sfn|Heath|1984|p=20}} The office of a deputy called {{translit|grc|[[topoteretes]]}} is also mentioned for the Imperial Fleet, but his role is unclear from the sources. He may have held a post similar to that of a [[Port Admiral (Royal Navy)|port admiral]].{{sfn|Pryor|Jeffreys|2006|p=271, note 364}} Although some of these senior officers were professional seamen, having risen from the ranks, most fleet commanders were high court officials, who would have relied on their more experienced professional subordinates for nautical expertise.{{sfn|Pryor|Jeffreys|2006|p=393}}

In the lower levels of organization, there was more uniformity: squadrons of three or five ships were commanded by a {{translit|grc|komes}} or {{translit|grc|droungarokomes}}, and each ship's captain was called {{translit|grc|[[kentarchos]]}} ('centurion'), although literary sources also used more archaic terms like {{translit|grc|[[navarch|nauarchos]]}} or even {{translit|grc|[[trierarch|trierarchos]]}}.{{sfn|Pryor|Jeffreys|2006|p=268}} Each ship's crew, depending on its size, was composed of one to three {{translit|grc|ousiai}}. Under the captain, there was the {{translit|grc|bandophoros}} ('banner bearer'), who acted as executive officer, two {{translit|grc|protokaraboi}} (sing. {{translit|grc|protokarabos}}, 'first ship-man'), sometimes also referred to archaically as {{translit|grc|kybernetes}}, and a bow officer, the {{translit|grc|proreus}}.{{sfn|Hocker|1995|p=97}} The {{translit|grc|protokaraboi}} were helmsmen, in charge of the steering oars in the stern, as well as of the rowers on either side of the ship. The senior of the two was the "first {{translit|grc|protokarabos}} ({{translit|grc|protos protokarabos}}).{{sfn|Kazhdan|1991|p=1745}} In actual terms, there probably were several of each kind of officer upon each ship, working in shifts.{{sfn|Pryor|Jeffreys|2006|p=275}} Most of these officers rose from the ranks, and there are references in the ''[[De Administrando Imperio]]'' to first oarsmen ({{translit|grc|protelatai}}) who rose to become {{translit|grc|protokaraboi}} in the imperial barges, and later assumed still higher offices; Emperor Romanos Lekapenos being the most successful example.{{sfn|Pryor|Jeffreys|2006|pp=270–271}} There were also a number of specialists on board, such as the two bow oarsmen and the {{translit|grc|siphonatores}}, who worked the siphons used for discharging the Greek fire.{{sfn|Hocker|1995|p=97}} A {{translit|grc|boukinator}} (trumpeter) is also recorded in the sources,{{sfn|Pryor|Jeffreys|2006|p=273}} who conveyed orders to the rowers ({{translit|grc|koplatai}} or {{translit|grc|elatai}}).{{sfn|Pryor|Jeffreys|2006|p=274}} Since the marine infantry were organized as regular army units,{{sfn|Pryor|Jeffreys|2006|p=274}} their ranks followed those of the [[Byzantine army|army]].

===Late period (1080s–1453)===
====Reforms of the Komnenoi====
After the decline of the navy in the 11th century, Alexios I rebuilt it on different lines. Since the thematic fleets had all but vanished, their remnants were amalgamated into a unified imperial fleet, under the new office of the {{translit|grc|megas doux}}. The first known occupant of the office was Alexios' brother-in-law John Doukas, in {{circa|1092}}. The {{translit|grc|megas droungarios tou ploïmou}}, once the overall naval commander, was subordinated to him, acting now as his principal aide.{{sfn|Haldon|1999|p=96}}{{sfn|Kazhdan|1991|p=1330}} The {{translit|grc|megas doux}} was also appointed as overall governor of southern Greece, the old themes of Hellas and the Peloponnese, which were divided into districts ({{translit|grc|oria}}) that supplied the fleet.{{sfn|Haldon|1999|p=144}}{{sfn|Magdalino|2002|pp=234–235}} Under John II, the Aegean islands also became responsible for the maintenance, crewing and provision of warships, and contemporary sources took pride in the fact that the great fleets of Manuel's reign were crewed by "native Romans", although use continued to be made of mercenaries and allied squadrons.{{sfn|Haldon|1999|p=96}}{{sfn|Magdalino|2002|p=233}} However, the fact that the fleet was now exclusively built and based around Constantinople, and that provincial fleets were not reconstituted, did have its drawbacks, as outlying areas, in particular Greece, were left vulnerable to attack.{{sfn|Lewis|Runyan|1985|p=37}}

====Nicaean navy====
With the decline of the Byzantine fleet in the latter 12th century, the Empire increasingly relied on the fleets of Venice and Genoa. Following the sack of 1204 however, sources suggest the presence of a relatively strong fleet already under the first Nicaean emperor, [[Theodore I Laskaris]], although specific details are lacking. Under John III and [[Theodore II Laskaris|Theodore II]] ({{reign|1254|1258}}), the navy had two main strategic areas of operations: the Aegean, entailing operations against the Greek islands (chiefly [[Rhodes]]) as well as the transport and supply of armies fighting in the Balkans, and the Sea of Marmara, where the Nicaeans aimed to interdict Latin shipping and threaten Constantinople. Smyrna provided the main shipyard and base for the Aegean, with a secondary one at [[Datça|Stadeia]], while the main base for operations in the Marmara Sea was Holkos, near [[Lampsakos]] across the [[Gallipoli peninsula]].{{sfn|Macrides|2007|pp=100–101}}

====Palaiologan navy====
Despite their efforts, the Nicaean emperors failed to successfully challenge the Venetian domination of the seas, and were forced to turn to the Genoese for aid.{{sfn|Nicol|1993|p=16}}{{sfn|Bartusis|1997|p=39}} After regaining Constantinople in 1261 however, Michael VIII initiated a great effort to lessen this dependence by building a "national" navy, forming a number of new corps to this purpose: the {{translit|grc|[[Gasmouloi]]}} ({{lang|grc|Γασμοῦλοι}}), who were men of mixed Greek-Latin descent living around the capital; and men from [[Laconia]], called {{translit|grc|Lakones}}) or {{translit|grc|[[Tsakonians|Tzakones]]}} ({{lang|grc|Τζάκωνες}}), were used as marines, forming the bulk of Byzantine naval manpower in the 1260s and 1270s.{{sfn|Ahrweiler|1966|p=405}}{{sfn|Bartusis|1997|pp=44–45}}{{sfn|Nicol|1993|p=42}} Michael also set the rowers, called {{translit|grc|Prosalentai}} ({{lang|grc|Προσαλενταί}}) or {{translit|grc|Proselontes}} ({{lang|grc|Προσελῶντες}}), apart as a separate corps.{{sfn|Bartusis|1997|p=46}} All these groups received small grants of land to cultivate in exchange for their service, and were settled together in small colonies.{{sfn|Bartusis|1997|p=158}} The {{translit|grc|Prosalentai}} were settled near the sea throughout the northern Aegean,{{sfn|Bartusis|1997|pp=46–47}} while the {{translit|grc|Gasmouloi}} and {{translit|grc|Tzakones}} were settled mostly around Constantinople and in [[Thrace]]. These corps remained extant, albeit in a diminished form, throughout the last centuries of the Empire; indeed the {{translit|grc|Gasmouloi}} of Gallipoli formed the bulk of the crews of the first Ottoman fleets after the Ottomans captured the area.{{sfn|Ahrweiler|1966|p=405}} Throughout the Palaiologan period, the fleet's main base was the harbour of [[Kontoskalion]] on the Marmara shore of Constantinople, dredged and refortified by Michael VIII.{{sfn|Nicol|1993|p=42}} Among the provincial naval centres, probably the most important was [[Monemvasia]] in the Peloponnese.{{sfn|Kazhdan|1991|p=1394}}

[[File:Porta del filarete, 1433-1445, 09, 06 giovanni paleologo.jpg|thumb|upright=1.3|[[John VIII Palaiologos|John VIII]] boarding his galley. Bronze door by [[Filarete]] in the [[St. Peter's Basilica]], about 1448]]

At the same time, Michael and his successors continued the well-established practice of using foreigners in the fleet. Alongside the mistrusted Italian city-states, with whom alliances shifted regularly, mercenaries were increasingly employed in the last centuries of the Empire, often rewarded for their services with [[fief]]s. Most of these mercenaries, like [[Giovanni de lo Cavo]] (lord of [[Anafi]] and Rhodes), [[Andrea Morisco]] (successor of de lo Cavo in Rhodes) and Benedetto Zaccaria (lord of Chios and Phocaea), were Genoese, the Byzantines' major ally in the period. Under Michael VIII, for the first time a foreigner, the Italian privateer [[Licario]], became {{translit|grc|megas doux}} and was given Euboea as a fief.{{sfn|Bartusis|1997|p=60}}{{sfn|Geanakoplos|1959|pp=209–211}} In 1303, another high rank, that of {{translit|grc|[[admiral|amerales]]}} ({{lang|grc|ἀμηράλης}} or {{lang|grc|ἀμηραλῆς}}) was introduced. The term had already entered Byzantine usage through contact with the Kingdom of Naples and other Western nations, but was rarely used; it was adopted as part of the imperial hierarchy, coming after the {{translit|grc|megas doux}} and the {{translit|grc|megas droungarios}}, with the arrival of the mercenaries of the Catalan Company. Only two holders are known, [[Ferran d'Aunés]] and Andrea Morisco, both from 1303 to 1305, although the rank continued to be mentioned in various lists of offices long after that.{{sfn|Failler|2003|pp=232–239}} Thus, according to the mid-14th century ''Book of Offices'', the subordinates of the {{translit|grc|megas doux}} were the {{translit|grc|megas droungarios tou stolou}}, the {{translit|grc|ameralios}}, the {{translit|grc|protokomes}}, the junior {{translit|grc|droungarioi}}, and the junior {{translit|grc|kometes}}.{{sfn|Guilland|1967|p=540}}{{sfn|Verpeaux|1966|p=167}} Pseudo-Kodinos also records that, while the other warships flew "the usual imperial flag" ({{lang|grc|βασιλικὸν φλάμουλον}}, {{translit|grc|basilikon phlamoulon}}) of the [[Tetragrammic cross|cross and the firesteels]], the {{translit|grc|megas doux}} flew an image of the emperor on horseback as his distinctive ensign.{{sfn|Verpeaux|1966|p=167}}

==Ships==
===Dromons and their derivatives===
{{details|Dromon}}
The primary warship of the Byzantine navy until the 12th century was the [[dromon]] and other similar ship types. Apparently an evolution of the light [[Liburnian (ship)|liburnian galleys]] of the imperial Roman fleets, the term first appears in the late 5th century, and was commonly used for a specific kind of war-galley by the 6th.{{sfn|Pryor|Jeffreys|2006|pp=123–125}} The term {{translit|grc|dromon}} ({{lang|grc|δρόμων}}) itself comes from the Greek root {{lang|grc|δρομ-(άω)}}, {{lit.|to run}}, thus meaning 'runner'; 6th-century authors like [[Procopius]] are explicit in their references to the speed of these vessels.{{sfn|Pryor|Jeffreys|2006|pp=125–126}} During the next few centuries, as the naval struggle with the Arabs intensified, heavier versions with two or possibly even three banks of oars evolved.{{sfn|Pryor|1995a|p=102}} Eventually, the term was used in the general sense of 'warship', and was often used interchangeably with another Byzantine term for a large warship, {{translit|grc|[[chelandion]]}} ({{lang|grc|χελάνδιον}}, from the Greek word {{translit|grc|keles}}, '[[Courser (horse)|courser]]'), which first appeared during the 8th century.{{sfn|Pryor|Jeffreys|2006|pp=166–169}}

====Evolution and features====
The appearance and evolution of medieval warships is a matter of debate and conjecture: until recently, no remains of an oared warship from either ancient or early medieval times had been found, and information had to be gathered by analyzing literary evidence, crude artistic depictions and the remains of a few merchant vessels. Only in 2005–2006 did archaeological digs for the [[Marmaray]] project in the location of the [[Harbour of Eleutherios|Harbour of Theodosius]] (modern Yenikapi) uncover the remains of over 36 Byzantine ships from the 6th to 10th centuries, including four light galleys of the {{translit|grc|galea}} type.{{sfn|Delgado|2011|pp=188–191}}

The accepted view is that the main developments which differentiated the early dromons from the liburnians, and that henceforth characterized Mediterranean galleys, were the adoption of a full [[Deck (ship)|deck]] ({{translit|grc|katastrōma}}), the abandonment of the [[ramming|rams]] on the bow in favour of an above-water spur, and the gradual introduction of [[lateen]] sails.{{sfn|Pryor|Jeffreys|2006|p=127}} The exact reasons for the abandonment of the ram ({{langx|la|rostrum}}; {{lang|grc|ἔμβολος}}, {{translit|grc|embolos}}) are unclear. Depictions of upward-pointing beaks in the 4th-century {{translit|grc|[[Vatican Vergil]]}} manuscript may well illustrate that the ram had already been replaced by a spur in late antique galleys.{{sfn|Pryor|Jeffreys|2006|pp=138–140}} One possibility is that the change occurred because of the gradual evolution of the ancient [[Trireme#Construction|shell-first]] [[mortise and tenon]] [[Hull (watercraft)|hull]] construction method, against which rams had been designed, into the skeleton-first method, which produced a stronger and more flexible hull, less susceptible to ram attacks.{{sfn|Pryor|Jeffreys|2006|pp=145–147, 152}} Certainly by the early 7th century, the ram's original function had been forgotten, if we judge by [[Isidore of Seville]]'s comments that they were used to protect against collision with underwater rocks.{{sfn|Pryor|Jeffreys|2006|pp=134–135}} As for the lateen sail, various authors have in the past suggested that it was introduced into the Mediterranean by the Arabs, possibly with an ultimate origin in [[India]]. However, the discovery of new depictions and literary references in recent decades has led scholars to antedate the appearance of the lateen sail in the Levant to the late [[Hellenistic]] or early Roman period.{{sfn|Casson|1995|pp=243–245, Fig. 180–182}}{{sfn|Basch|2001|pp=57–64}}{{sfn|Campbell|1995|pp=8–11}}{{sfn|Pomey|2006|pp=326–329}} Not only the triangular, but also the quadrilateral version were known, used for centuries (mostly on smaller craft) in parallel with square sails.{{sfn|Casson|1995|pp=243–245, Fig. 180–182}}{{sfn|Pryor|Jeffreys|2006|pp=153–159}} Belisarius' invasion fleet of 533 was apparently at least partly fitted with lateen sails, making it probable that by the time the lateen had become the standard rig for the dromon,{{sfn|Basch|2001|p=64}} with the traditional square sail gradually falling from use in medieval navigation.{{sfn|Pryor|Jeffreys|2006|pp=153–159}}

The dromons that Procopius describes were single-banked ships of probably 50 oars, arranged with 25 oars on each side.{{sfn|Pryor|Jeffreys|2006|pp=130–135}} Again unlike Hellenistic vessels, which used an [[outrigger]] ({{translit|grc|parexeiresia}}), these extended directly from the hull.{{sfn|Pryor|1995a|pp=103–104}} In the later [[bireme]] dromons of the 9th and 10th centuries, the two oar banks ({{translit|grc|elasiai}}) were divided by the deck, with the first oar bank was situated below, whilst the second oar bank was situated above deck; these rowers were expected to fight alongside the marines in boarding operations.{{sfn|Pryor|Jeffreys|2006|pp= 232, 255, 276}} Makrypoulias suggests 25 oarsmen beneath and 35 on the deck on either side for a dromon of 120 rowers.{{sfn|Makrypoulias|1995|pp=164–165}} The overall length of these ships was probably about 32 meters.{{sfn|Pryor|Jeffreys|2006|pp=205, 291}} Although most contemporary vessels had a single mast ({{translit|grc|histos}} or {{translit|grc|katartion}}), the larger bireme dromons probably needed at least two masts in order to manoeuvre effectively,{{sfn|Pryor|Jeffreys|2006|p=238}} assuming that a single lateen sail for a ship this size would have reached unmanageable dimensions.{{sfn|Dolley|1948|p=52}} The ship was steered by means of two [[rudder|quarter rudders]] at the [[stern]] ({{translit|grc|prymne}}), which also housed a tent ({{translit|grc|skene}}) that covered the captain's berth ({{translit|grc|krab[b]at[t]os}}).{{sfn|Pryor|Jeffreys|2006|p=215}} The prow ({{translit|grc|prora}}) featured an elevated forecastle ({{translit|grc|pseudopation}}), below which the siphon for the discharge of Greek fire projected,{{sfn|Pryor|Jeffreys|2006|p=203}} although secondary siphons could also be carried amidships on either side.{{sfn|Haldon|1999|p=189}} A pavesade ({{translit|grc|kastelloma}}), on which marines could hang their shields, ran around the sides of the ship, providing protection to the deck crew.{{sfn|Pryor|Jeffreys|2006|p=282}} Larger ships also had wooden castles ({{translit|grc|xylokastra}}) on either side between the masts, similar to those attested for the Roman liburnians, providing archers with elevated firing platforms.{{sfn|Pryor|1995a|p=104}} The bow spur ({{translit|grc|peronion}}) was intended to ride over an enemy ship's oars, breaking them and rendering it helpless against missile fire and boarding actions.{{sfn|Pryor|Jeffreys|2006|pp=143–144}}

The four {{translit|grc|galeai}} ships uncovered in the Yenikapi excavations, dating to the 10th–11th centuries, are of uniform design and construction, suggesting a centralized manufacturing process. They have a length of {{circa|30}} m, and are built of [[European Black Pine]] and [[Oriental plane]].{{sfn|Delgado|2011|pp=190–191}}

====Ship types====
[[File:Byzantinischer Kampfschwimmer.jpg|thumb|upright=1.35|right|Depiction of a sea battle, from a 13th-century copy of [[Oppian]]'s ''Cynegetica'']]
By the 10th century, there were three main classes of bireme (two oar-banks) warships of the general dromon type, as detailed in the inventories for the Cretan expeditions of 911 and 949: the {{translit|grc|[chelandion] ousiakon}} ({{lang|grc|[χελάνδιον] οὑσιακόν}}), so named because it was manned by an {{translit|grc|ousia}} of 108; the {{translit|grc|[chelandion] pamphylon}} ([χελάνδιον] πάμφυλον), crewed with up to 120–160 men, its name either implying an origin in the region of Pamphylia as a transport ship or its crewing with "picked crews" (from {{lang|grc|πᾶν+φῦλον}}, 'all tribes'); and the {{translit|grc|dromon}} proper, crewed by two {{translit|grc|ousiai}}.{{sfn|Pryor|Jeffreys|2006|pp=189–192, 372}}{{sfn|Casson|1995|pp=149–150}} In the ''De Ceremoniis'', the heavy {{translit|grc|dromon}} is said to have an even larger crew of 230 rowers and 70 marines; naval historian John H. Pryor considers them as supernumerary crews being carried aboard, while the Greek scholar Christos Makrypoulias suggests that the extra men correspond to a second rower on each of the upper-bank oars.{{sfn|Pryor|Jeffreys|2006|pp=261–262}}{{sfn|Makrypoulias|1995|p=165}} A smaller, single-bank ship, the {{translit|grc|moneres}} ({{lang|grc|μονήρης}}, 'single-banked') or {{translit|grc|galea}} ({{lang|grc|γαλέα}}, from which the term 'galley' derives), with {{circa|60}} men as crew, was used for scouting missions but also in the wings of the battle line.{{sfn|Pryor|Jeffreys|2006|p=190}} The {{translit|grc|galea}} in particular seems to have been strongly associated with the Mardaites, and Christos Makrypoulias even suggests that the ship was exclusively used by them.{{sfn|Makrypoulias|1995|pp=159–161}} Three-banked ('trireme') dromons are described in a 9th-century work dedicated to the {{translit|grc|[[parakoimomenos]]}} [[Basil Lekapenos]]. However, this treatise, which survives only in fragments, draws heavily upon references on the appearance and construction of a Classical [[trireme]], and must therefore be used with care when trying to apply it to the warships of the middle Byzantine period.{{sfn|Pryor|2003|p=84}}{{sfn|Pryor|Jeffreys|2006|pp=284–286}} The existence of trireme vessels is, however, attested in the [[Fatimid navy]] in the 11th and 12th centuries, and references made by Leo VI to large Arab ships in the 10th century may also indicate trireme galleys.{{sfn|Pryor|1995a|p=108}}

For cargo transport, the Byzantines usually commandeered ordinary merchantmen as transport ships ({{translit|grc|phortegoi}}) or supply ships ({{translit|grc|skeuophora}}). These appear to have been mostly sailing vessels, rather than oared.{{sfn|Pryor|Jeffreys|2006|p=305}} The Byzantines and Arabs also employed [[Horse transports in the Middle Ages|horse-transports]] ({{translit|grc|hippagoga}}), which were either sailing ships or galleys, the latter certainly modified to accommodate the horses.{{sfn|Pryor|Jeffreys|2006|pp=307–308, 322–324}} Given that the {{translit|grc|chelandia}} appear originally to have been oared horse-transports, this would imply differences in construction between the {{translit|grc|chelandion}} and the {{translit|grc|dromon}} proper, terms which otherwise are often used indiscriminately in literary sources. While the {{translit|grc|dromon}} was developed exclusively as a war galley, the {{translit|grc|chelandion}} would have had to have a special compartment amidships to accommodate a row of horses, increasing its [[Beam (nautical)|beam]] and [[Hold (ship)|hold]] depth.{{sfn|Pryor|Jeffreys|2006|pp=166–169, 322–325, 449}} In addition, Byzantine sources refer to the {{translit|grc|sandalos}} or {{translit|grc|sandalion}} ({{lang|grc|σάνδαλος}}, {{lang|grc|σανδάλιον}}), which was a boat carried along by the bigger ships. The kind described in the ''De Ceremoniis'' had a single mast, four oars and a rudder.{{sfn|Makrypoulias|1995|p=168}} In the earlier years of the empire, shipbuilding wood for transport and supply ships was mainly from [[conifer]]s, but in the later years from [[broad-leaved tree]]s, possibly from forests in what is now Turkey.{{sfn|Akkemik|Kocabas|2014}}

===Western designs of the last centuries===
[[File:Galley.jpg|thumb|right|14th-century painting of a light [[galley]], from an icon now at the [[Byzantine and Christian Museum]] at [[Athens]]]]
The exact period when the dromon was superseded by {{translit|grc|galea}}-derived ships of Italian origin is uncertain. The term {{translit|grc|dromon}} continued in use until the late 12th century, although Byzantine writers were indiscriminate in their use of it.{{sfn|Pryor|Jeffreys|2006|pp=407–411}} Contemporary Western writers used the term to denote large ships, usually transports, and there is evidence to support the idea that this usage had also spread to the Byzantines.{{sfn|Pryor|Jeffreys|2006|pp=413–415}} [[William of Tyre]]'s description of the Byzantine fleet in 1169, where "dromons" are classed as very large transports, and the warships with two oar banks are set apart from them, may thus indeed indicate the adoption of the new bireme galley types by the Byzantines.{{sfn|Pryor|Jeffreys|2006|pp=415–416}} From the 13th century on, the term {{translit|grc|dromon}} fell into gradual disuse and was replaced by {{translit|grc|katergon}} ({{lang|grc|κάτεργον}}, meaning 'detailed to/owing a service'), a late-11th century term which originally applied to the crews, who were drawn from populations detailed to military service.{{sfn|Pryor|Jeffreys|2006|pp=418–419}} During the latter period of the Byzantine Empire, Byzantine ships were based on Western models: the term {{translit|grc|katergon}} is used indiscriminately for both Byzantine and Latin ships, and the horse-carrying {{translit|grc|chelandion}} was replaced by the Western {{translit|grc|taride}} (itself deriving from Arabic {{translit|ar|tarrida}}, adopted as {{translit|grc|tareta}}, {{lang|grc|ταρέτα}}, in Greek).{{sfn|Pryor|Jeffreys|2006|p=420}} A similar process is seen in surviving sources from [[Capetian House of Anjou|Angevin]] Sicily, where the term {{translit|fr|lang}} was replaced by the {{lang|fr|taride}}, although for a time both continued to be used. No construction differences are mentioned between the two, with both terms referring to horse-carrying vessels ({{lang|la|usserii}}) capable of carrying from 20 to 40 horses.{{sfn|Pryor|1995a|p=115}}

The bireme Italian-style galleys remained the mainstay of Mediterranean fleets until the late 13th century, although again, contemporary descriptions provide little detail on their construction.{{sfn|Pryor|1995a|pp=110–111}} From that point on, the galleys universally became trireme ships, i.e. with three men on a single bank located above deck, each rowing a different oar; the so-called {{lang|it|alla sensile}} system.{{sfn|Pryor|1995a|p=116}}{{sfn|Casson|1995|p=123}} The Venetians also developed the so-called "{{ill|great galley|it|galea grossa}}", which was an enlarged galley capable of carrying more cargo for trade.{{sfn|Casson|1995|pp=123–124}}

Little is known on particular Byzantine ships during the period. The accounts of the 1437 journey by sea of the Byzantine delegation to the [[Council of Florence]], by the Byzantine cleric Sylvester Syropoulos and the Greek-Venetian captain Michael of Rhodes, mention that most of the ships were Venetian or Papal, but also record that Emperor John VIII travelled on an "imperial ship". It is unclear whether that ship was Byzantine or had been hired, and its type is not mentioned. It is, however, recorded as having been faster than the Venetian great merchant galleys accompanying it, possibly indicating that it was a light war galley.{{sfn|Andriopoulou|Kondyli|2008}} Michael of Rhodes also wrote a treatise on shipbuilding, which provided construction instructions and illustrations of the main vessels, both [http://brunelleschi.imss.fi.it/michaelofrhodes/ships_galleys.html galleys] and [http://brunelleschi.imss.fi.it/michaelofrhodes/ships_sailing.html sailing ships], used by Venice and the other maritime states of the region in the first half of the 15th century.

==Tactics and weapons==
The Byzantines took care to codify, preserve and pass on the lessons of warfare at land and sea from past experience, through the use of [[Byzantine military manuals|military manuals]]. Despite their sometimes antiquarian terminology, these texts form the basis of our knowledge on Byzantine naval affairs. The main surviving texts are the chapters on sea combat ({{translit|grc|peri naumachias}}) in the ''[[Tactica of Leo the Wise|Tactica]]'' of Leo the Wise and [[Nikephoros Ouranos]] (both drawing extensively from the ''Naumachiai'' of [[Byzantine military manuals|Syrianos Magistros]] and other earlier works),{{sfn|Pryor|2003|p=84}} complemented by relevant passages in the ''De Administrando Imperio'' of Constantine Porphyrogennetos and other works by Byzantine and Arab writers.{{sfn|Hocker|1995|p=98}}

===Naval strategy, logistics and tactics===
When examining ancient and medieval naval operations, it is necessary to first understand the technological limitations of galley fleets. Galleys did not handle well in rough waters and could be swamped by waves, which would be catastrophic in the open sea; history is replete with instances where galley fleets were sunk by bad weather (e.g. the Roman losses during the [[First Punic War#Naval warfare|First Punic War]]).{{sfn|Pryor|1988|p=70}} The sailing season was therefore usually restricted from mid-spring to September.{{sfn|Pryor|1995b|p=209}} The maintainable cruising speed of a galley, even when using sails, was limited, as were the amount of supplies it could carry.{{sfn|Pryor|1988|pp=71–77}} Water in particular, being essentially a galley's "fuel" supply, was of critical importance. There is no evidence that the navy operated dedicated supply ships to support the warships.{{sfn|McMahon|2021|p=69}} With consumption levels estimated at 8 litres a day for every oarsman, its availability was a decisive operational factor in the often water-scarce and sun-baked coasts of the Eastern Mediterranean.{{sfn|Pryor|Jeffreys|2006|pp=354, 356–357}} Smaller dromons are estimated to have been able to carry about four days' worth of water.{{sfn|Pryor|Jeffreys|2006|p=360}} Effectively, this meant that fleets composed of galleys were confined to coastal routes,{{sfn|Pryor|1988|p=70}} and had to make frequent landfall to replenish their supplies and rest their crews.{{sfn|Dotson|1995|pp=219–220}} This is well attested in Byzantine overseas endeavours, from Belisarius' campaign against the Vandals to the Cretan expeditions of the 9th and 10th centuries. It is for these reasons that Nikephoros Ouranos emphasizes the need to have available "men with accurate knowledge and experience of the sea [...], which winds cause it to swell and which blow from the land. They should know both the hidden rocks in the sea, and the places which have no depth, and the land along which one sails and the islands adjacent to it, the harbours and the distance such harbours are the one from the other. They should know both the countries and the water supplies."{{sfn|Pryor|Jeffreys|2006|p=360}}

Medieval Mediterranean naval warfare was therefore essentially coastal and amphibious in nature, carried out to seize coastal territory or islands, and not to exercise "[[sea control]]" as it is understood today.{{sfn|Pryor|Jeffreys|2006|pp=388–389}} Furthermore, following the abandonment of the ram, the only truly "ship-killing" weapon available prior to the advent of gunpowder and explosive shells,{{sfn|Pryor|Jeffreys|2006|p=383}} sea combat became, in the words of John Pryor, "more unpredictable. No longer could any power hope to have such an advantage in weaponry or the skill of crews that success could be expected."{{sfn|Pryor|Jeffreys|2006|p=387}} It is no surprise therefore that the Byzantine and Arab manuals emphasize cautious tactics, with the priority given to the preservation of one's own fleet, and the acquisition of accurate intelligence, often through the use of spies posing as merchants. Emphasis was placed on achieving tactical surprise and, conversely, on avoiding being caught unprepared by the enemy. Ideally, battle was to be given only when assured of superiority by virtue of numbers or tactical disposition.{{sfn|Christides|1981|pp=79–80}}{{sfn|Pryor|Jeffreys|2006|pp=387–392}} Importance is also laid on matching one's forces and tactics to the prospective enemy: Leo VI, for instance, contrasted (''Tactica'', XIX.74–77) the Arabs with their heavy and slow ships ({{translit|grc|koumbaria}}), to the small and fast craft ({{translit|grc|akatia}}, chiefly monoxyla), of the Slavs and Rus'.{{sfn|Pryor|Jeffreys|2006|pp=513–515}}

On campaign, following the assembly of the various squadrons at fortified bases ({{translit|grc|[[aplekton|aplekta]]}}) along the coast, the fleet consisted of the main body, composed of the oared warships, and the baggage train ({{translit|grc|touldon}}) of sailing vessels and oared transports, which would be sent away in the event of battle.{{sfn|Pryor|Jeffreys|2006|pp=394–395}} The battle fleet was divided into squadrons, and orders were transmitted from ship to ship through signal flags ({{translit|grc|kamelaukia}}) and lanterns.{{sfn|Pryor|Jeffreys|2006|pp=396–399}} The navy played key role in supplying land-based forces.{{sfn|McMahon|2021|pp=63-79}}

[[File:Byzantines repel the Russian attack of 941.jpg|thumb|right|upright=1.35|The Byzantine fleet repels the Rus' attack on Constantinople in 941. Boarding actions and hand-to-hand fighting determined the outcome of most naval battles in the Middle Ages. Here the Byzantine dromons are shown rolling over the Rus' vessels and smashing their oars with their spurs.{{sfn|Pryor|Jeffreys|2006|p=144}}]]

On the approach to and during an actual battle, a well-ordered formation was critical: if a fleet fell into disorder, its ships would be unable to lend support to each other and probably would be defeated.{{sfn|Pryor|Jeffreys|2006|p=399}} Fleets that failed to keep an ordered formation or that could not order themselves into an appropriate counter-formation ({{translit|grc|antiparataxis}}) to match that of the enemy, often avoided, or broke off from battle.{{sfn|Pryor|2003|p=100}}{{sfn|Pryor|Jeffreys|2006|pp=399–400}} Tactical manoeuvres were therefore intended to disrupt the enemy formation,{{sfn|Pryor|2003|p=100}} including the use of various [[wikt:stratagem|stratagems]], such as dividing one's force and carrying out flanking manoeuvres, feigning retreat or hiding a reserve in ambush (''Tactica'', XIX.52–56).{{sfn|Pryor|Jeffreys|2006|pp=505–507}} Indeed, Leo VI openly advised (''Tactica'', XIX.36) against direct confrontation and advocates the use of stratagems instead.{{sfn|Pryor|Jeffreys|2006|p=499}} According to Leo VI (''Tactica'', XIX.52), a crescent formation seems to have been the norm, with the flagship in the centre and the heavier ships at the horns of the formation, in order to turn the enemy's flanks.{{sfn|Pryor|Jeffreys|2006|p=505}} A range of variants and other tactics and counter-tactics was available, depending on the circumstances.{{sfn|Hocker|1995|p=98}}

Once the fleets were close enough, exchanges of missiles began, ranging from combustible projectiles to arrows and javelins. The aim was not to sink ships, but to deplete the ranks of the enemy crews before the [[boarding (attack)|boarding actions]], which decided the outcome.{{sfn|Pryor|Jeffreys|2006|p=402}} Once the enemy strength was judged to have been reduced sufficiently, the fleets closed in, the ships grappled each other, and the marines and upper bank oarsmen boarded the enemy vessel and engaged in hand-to-hand combat.{{sfn|Pryor|2003|pp=102–104}}

===Armament===
[[File:Liquid fire granades Chania.jpg|thumb|right|Greek fire [[grenade]]s and [[caltrop]]s from Crete, dated to the 10th and 12th centuries]]
Unlike the warships of Antiquity, Byzantine and Arab ships did not feature rams, and the primary means of ship-to-ship combat were boarding actions and missile fire, as well as the use of inflammable materials such as Greek fire.{{sfn|Hocker|1995|p=99}} Despite the fearsome reputation of the latter, it was only effective under certain circumstances, and not the decisive anti-ship weapon that the ram had been in the hands of experienced crews.{{sfn|Pryor|2003|p=96}}

Like their Roman predecessors, Byzantine and Muslim ships were equipped with small [[catapult]]s ({{translit|grc|mangana}}) and [[ballista]]e ({{translit|grc|toxoballistrai}}) that launched stones, arrows, javelins, pots of Greek fire or other incendiary liquids, [[caltrop]]s ({{translit|grc|triboloi}}) and even containers full of [[Lime (material)|lime]] to choke the enemy or, as Emperor Leo VI suggests, scorpions and snakes (''Tactica'', XIX.61–65).{{sfn|Pryor|Jeffreys|2006|p=509}} Marines and the upper-bank oarsmen were heavily armoured in preparation for battle (Leo referred to them as "cataphracts") and armed with close-combat arms such as lances and swords, while the other sailors wore padded felt jackets ({{translit|grc|neurika}}) for protection and fought with bows and crossbows.{{sfn|Pryor|Jeffreys|2006|p=381}} The importance and volume of missile fire during sea combat can be gauged from the fleet manifests for the Cretan expeditions of the 10th century, which mention 10,000 caltrops, 50 bows and 10,000 arrows, 20 hand-carried {{translit|grc|ballistrai}} with 200 bolts {{translit|grc|myai}}, 'flies') and 100 javelins per dromon.{{sfn|Pryor|2003|p=102}}

From the 12th century on, the [[crossbow]] (called {{lang|grc|τζᾶγγρα}}, {{translit|grc|tzangra}} in Greek) became increasingly important in Mediterranean warfare, remaining the most deadly weapon available until the advent of fully rigged ships with gunpowder artillery.{{sfn|Dotson|2003|p=134}} The Byzantines made infrequent use of the weapon, chiefly in sieges, although its use is recorded in some sea battles.{{sfn|Bartusis|1997|pp=298–299, 331}} [[Cannon]]s were introduced in the latter half of the 14th century, but they were rarely used by the Byzantines, who only had a few artillery pieces for the defence of the [[Theodosian Walls|land walls]] of Constantinople. Unlike the Venetians and Genoese, there is no indication that the Byzantines ever mounted any on ships.{{sfn|Heath|McBride|1995|pp=19–21}}

===Greek fire===
{{details|Greek fire}}
[[File:Greekfire-madridskylitzes1.jpg|thumb|right|upright=1.35|Depiction of the use of Greek fire in the [[John Skylitzes|Madrid Skylitzes manuscript]]]]
"Greek fire" was the name given by Western Europeans to the flammable concoction used by the Byzantines, so called because the Europeans viewed the Byzantines as [[Greeks]] instead of [[Rhomaioi|Romans]]. The Byzantines themselves used various descriptive names for it, but the most common was 'liquid fire' ({{lang|grc|ὑγρόν πῦρ}}). Although the use of incendiary chemicals by the Byzantines has been attested to since the early 6th century, the actual substance known as Greek fire is believed to have been created in 673 and is attributed to an engineer from Syria, named Kallinikos.{{sfn|Pryor|Jeffreys|2006|pp=607–609}}  The most common method of deployment was to emit the formula through a large bronze tube ({{translit|grc|siphon}}) onto enemy ships.{{sfn|Hocker|1995|p=99}} Alternatively, it could be launched in jars fired from catapults; pivoting [[Crane (machine)|cranes]] ({{translit|grc|gerania}}) are also mentioned as a method of pouring combustibles onto enemy ships.{{sfn|Pryor|Jeffreys|2006|pp=378–379}} Usually the mixture would be stored in heated, pressurized barrels and projected through the tube by some sort of pump while the operators were sheltered behind large iron shields. A portable version ({{translit|grc|cheirosiphon}}) also existed, reputedly invented by Leo VI, making it the direct analogue to a modern [[flamethrower]].{{sfn|Pryor|1995a|p=105}} The means of its production was kept a state secret, and its components are only roughly guessed or described through secondary sources like [[Anna Komnene]], so that its exact composition remains to this day unknown. In its effect, the Greek fire must have been rather similar to [[napalm]].{{sfn|Hocker|1995|p=99}} Contemporary sources make clear that it could not be extinguished by water, but rather floated and burned on top of it; sand could extinguish it by depriving it of oxygen, and several authors also mention strong vinegar and old urine as being able to extinguish it, presumably by some sort of chemical reaction. Consequently, felt or hides soaked in vinegar were used to provide protection against it.{{sfn|Pryor|Jeffreys|2006|p=617}}

{{quote box
| width     = 260px
| align     = right
| bgcolor   = 
| title     =
| quote     = "As he [the Emperor] knew that the [[Pisa]]ns were skilled in sea warfare and dreaded a battle with them, on the prow of each ship he had a head fixed of a lion or other land-animal, made in brass or iron with the mouth open and then gilded over, so that their mere aspect was terrifying. And the fire which was to be directed against the enemy through tubes he made to pass through the mouths of the beasts, so that it seemed as if the lions and the other similar monsters were vomiting the fire."
| source    = From the ''[[Alexiad]]'' of [[Anna Komnene]], XI.10{{sfn|Dawes|1928|p=292}}
}}

Despite the somewhat exaggerated accounts of Byzantine writers, it was by no means a "wonder weapon", and did not avert some serious defeats.{{sfn|Pryor|2003|p=97}}{{sfn|Christides|1984|p=64}} Given its limited range, and the need for a calm sea and favourable wind conditions, its usability was limited.{{sfn|Pryor|Jeffreys|2006|p=384}} Nevertheless, in favourable circumstances and against an unprepared enemy, its great destructive ability and psychological impact could prove decisive, as displayed repeatedly against the Rus'. Greek fire continued to be mentioned during the 12th century, but the Byzantines failed to use it against the Fourth Crusade, possibly because they had lost access to the areas (the [[Caucasus]] and the eastern coast of the Black Sea) where the primary ingredients were to be found.{{sfn|Pryor|Jeffreys|2006|pp=630–631}} The Arabs fielded their own 'liquid fire' after 835, but it is unknown if they used the Byzantine formula, possibly obtained through espionage or through the defection of {{translit|grc|strategos}} Euphemios in 827, or whether they independently created a version of their own.{{sfn|Hocker|1995|p=99}} A 12th-century treatise prepared by [[Mardi bin Ali al-Tarsusi]] for [[Saladin]] records a version of Greek fire, called {{translit|ar|naft}} ([[naphtha]]), which had a [[petroleum]] base, with sulphur and various resins added.{{sfn|Pryor|Jeffreys|2006|pp=610–611}}

==Role of the navy in Byzantine history==
It is not easy to assess the importance of the Byzantine navy to the Empire's history. On one hand, the Empire, throughout its life, had to defend a long coastline, often with little [[hinterland]]. In addition, shipping was always the quickest and cheapest way of transport, and the Empire's major urban and commercial centres, as well as most of its fertile areas, lay close to the sea.{{sfn|Mango|2002|p=197}} Coupled with the threat posed by the Arabs in the 7th to 10th centuries, this necessitated the maintenance of a strong fleet. The navy was perhaps at its most significant in the successful defence of Constantinople from the two Arab sieges, which ultimately saved the Empire. Throughout the period however, naval operations were an essential part of the Byzantine effort against the Arabs in a game of raids and counter-raids that continued up to the late 10th century.{{sfn|Pryor|Jeffreys|2006|p=386}}

On the other hand, the nature and limitations of the maritime technology of the age meant that the neither the Byzantines nor any of their opponents could develop a true [[thalassocracy]].{{sfn|Pryor|Jeffreys|2006|pp=388–390}} Galley fleets were confined to coastal operations, and were not able to play a truly independent role. Furthermore, as the alternation of Byzantine victories and defeats against the Arabs illustrates, no side was able to permanently gain the upper hand. Although the Byzantines pulled off a number of spectacular successes, such as Nasar's remarkable night-time victory in 880 (one of a handful of similar engagements in the Middle Ages), these victories were balanced off by similarly disastrous losses.{{sfn|Pryor|Jeffreys|2006|p=385}} Reports of mutinies by oarsmen in Byzantine fleets also reveal that conditions were often far from the ideal prescribed in the manuals.{{sfn|Pryor|Jeffreys|2006|pp=385–386}} Combined with the traditional predominance of the great [[Anatolia]]n land-holders in the higher [[Byzantine aristocracy and bureaucracy|military and civil offices]], all this meant that, as in the Roman Empire, the navy, even at its height, was still regarded largely as an adjunct to the land forces. This fact is clearly illustrated by the relatively lowly positions its admirals held in the imperial hierarchy.{{sfn|Pryor|2003|pp=103–104}}{{sfn|Runciman|1975|p=149}}

It is clear nevertheless that the gradual decline of the indigenous Byzantine naval power in the 10th and 11th centuries, when it was eclipsed by the Italian city-states, chiefly Venice and later Genoa, was of great long-term significance for the fate of the Empire. The sack of the Fourth Crusade, which shattered the foundations of the Byzantine state, was due in large part to the absolute defencelessness of the Empire at sea.{{sfn|Lewis|Runyan|1985|pp=38–39}} This process was initiated by Byzantium itself in the 9th century, when the Italians were increasingly employed by the Empire to compensate for its own naval weakness in the West. The Italian republics also profited from their role as intermediaries in the trade between the Empire and Western Europe, marginalizing the Byzantine merchant marine, which in turn had adverse effects on the availability of Byzantine naval forces.{{sfn|Scafuri|2002|pp=58–59, 61–63}} Inevitably however, as the Italian republics slowly moved away from the Byzantine orbit, they began pursuing their own policies, and from the late 11th century on, they turned from protection of the Empire to exploitation and sometimes outright plunder, heralding the eventual financial and political subjugation of Byzantium to their interests.{{sfn|Lane|1973|p=34}} The absence of a strong navy was certainly keenly felt by the Byzantines at the time, as the comments of Kekaumenos illustrate. Strong and energetic emperors like Manuel Komnenos, and later Michael VIII Palaiologos, could revive Byzantine naval power, but even after landing heavy strokes against the Venetians, they merely replaced them with the Genoese and the Pisans. Trade thus remained in Latin hands, its profits continued to be siphoned off from the Empire, and after their deaths, their achievements quickly evaporated.{{sfn|Lewis|Runyan|1985|p=37}} After 1204, and with the brief exception of Michael VIII's reign, the fortunes of the now small Byzantine navy were more or less tied to the shifting alliances with the Italian maritime republics.{{sfn|Bartusis|1997|p=10}}

When viewing the entire course of Byzantine history, the waxing and waning of the navy's strength closely mirrors the fluctuation of the Empire's fortunes. It is this apparent interrelation that led the French Byzantinist [[Louis Bréhier]] to remark: "The epochs of [Byzantium's] dominion are those in which it held control of the sea, and it was when it lost it, that its reverses began."<ref>{{Citation | last=Bréhier | first=Louis | title=La marine de Byzance du VIII<sup>e</sup> au XI<sup>e</sup> siècle | journal=Byzantion | volume=19 |year=1949 | postscript=.}}, cited in {{Harvnb|Scafuri|2002|p=2}}</ref>

==See also==
{{commons category|Navy of the Byzantine Empire}}
{{clear}}

==Notes==
{{reflist|20em}}

==Bibliography==
{{sfn whitelist |CITEREFHocker1995 |CITEREFPryor1995a |CITEREFPryor1995b |CITEREFDotson1995}}
{{refbegin|30em}}
* {{citation
 | first = Hélène
 | last = Ahrweiler
 | author-link=Helene Ahrweiler
 | title = Byzance et la mer. La marine de guerre, la politique et les institutions maritimes de Byzance aux VIIe–XVe siècles
 | publisher = Presses Universitaires de France
 | language = fr
 | place = Paris
 | year = 1966
 | url={{Google Books|8H8JAQAAIAAJ|plainurl=y}}
 }}
* {{Cite journal|last1=Akkemik|first1=Ünal|last2=Kocabas|first2=Ufuk|date=January 2014|title=Woods of byzantine trade ships of Yenikapi (Istanbul) and changes in wood use from 6th to 11th century |journal=Mediterranean Archaeology and Archaeometry|volume=14|issue=2|pages=301–311 |url=https://www.researchgate.net/publication/279084550 |via=ResearchGate}}
* {{cite web |last1=Andriopoulou |first1=Vera |last2=Kondyli |first2=Fotini |date=19 June 2008 |title=Ships on the Voyage from Constantinople to Venice |work=The Syropoulos Project |publisher=The Institute of Archaeology and Antiquity of the University of Birmingham |url=http://syropoulos.co.uk/ships.htm |access-date=2009-03-09}}
* {{citation
 | first=Dimiter
 | last=Angelov
 | title=IImperial Ideology and Political Thought in Byzantium, 1204–1330
 | publisher=Cambridge University Press
 | year=2007
 | isbn=978-0-521-85703-1
 | url={{Google Books|Vce6EJAcHA4C|plainurl=y}}
 }}
* {{citation
 | first = Mark C.
 | last = Bartusis
 | title = The Late Byzantine Army: Arms and Society 1204–1453
 | publisher = University of Pennsylvania Press
 | year = 1997
 | isbn = 0-8122-1620-2
 | url={{Google Books|rUs-hHd89xAC|plainurl=y}}
}}
* {{citation
 | first = Lucien
 | last = Basch
 | editor-last = Tzalas
 | editor-first = H.
 | contribution = La voile latine, son origine, son évolution et ses parentés arabes
 | title = Tropis VI, 6th International Symposium on Ship Construction in Antiquity, Lamia 1996 proceedings
 | language = fr
 | year = 2001
 | pages = 55–85
 | place = Athens
 | publisher = Hellenic Institute for the Preservation of Nautical Tradition
 }}
* {{Citation |last=Bashear |first=Suliman |year=1991 |title=Apocalyptic and Other Materials on Early Muslim-Byzantine Wars: A Review of Arabic Sources |journal=[[Journal of the Royal Asiatic Society]] |volume=1 |issue=2 |pages=173–207 |jstor=25182323 |publisher=Cambridge University Press |doi=10.1017/S1356186300000572|s2cid=161589616 }}
* {{citation
 | first = John W.
 | last = Birkenmeier
 | title = The Development of the Komnenian Army: 1081–1180
 | publisher = Brill
 | year = 2002
 | isbn = 90-04-11710-5
 | url={{Google Books|p8OOoGWRC2EC|plainurl=y}}
 }}
* {{citation
 | first = Louis
 | last = Bréhier
 | author-link = Louis Bréhier
 | title = Les institutions de l'empire byzantin
 | language = fr
 | publisher = Albin Michel
 | year = 2000
 | location = Paris
 | isbn = 978-2-226-04722-9
 }}
* {{citation
 | first=Anthony Applemore Mornington
 | last=Bryer
 | title=Shipping in the empire of Trebizond
 | journal=The Mariner's Mirror
 | volume=52
 | year=1966
 | pages=3–12
 | doi=10.1080/00253359.1966.10659307
 }}
* {{The Imperial Administrative System of the Ninth Century}}
* {{citation
 |first        = I.C.
 |last         = Campbell
 |title        = The Lateen Sail in World History
 |journal      = Journal of World History
 |volume       = 6
 |issue        = 1
 |year         = 1995
 |pages        = 1–23
 |url          = http://www.uhpress.hawaii.edu/journals/jwh/jwh061p001.pdf
 |access-date  = 2016-08-04
 |archive-url  = https://web.archive.org/web/20160804061252/http://www.uhpress.hawaii.edu/journals/jwh/jwh061p001.pdf
 |archive-date = 2016-08-04
 |url-status=dead
}}
* {{citation
 | first = Lionel
 | last = Casson
 | author-link = Lionel Casson
 | title = The Ancient Mariners: Seafarers and Sea Fighters of the Mediterranean in Ancient Times
 | publisher = Princeton University Press
 | year = 1991
 | isbn = 978-0-691-01477-7
 | url = {{Google Books|4Ls6MczXvBEC|plainurl=y}}
 }}
* {{citation
 | first = Lionel
 | last = Casson
 | author-link = Lionel Casson
 | title = Ships and Seamanship in the Ancient World
 | publisher = Johns Hopkins University Press
 | year = 1995
 | isbn = 0-8018-5130-0
 }}
* {{citation
 | last=Christides
 | first= Vassilios
 | title=The Raids of the Moslems of Crete in the Aegean Sea: Piracy and Conquest
 | journal=Byzantion
 | volume=51
 | year=1981
 | pages=76–111
}}
* {{citation
 | last=Christides
 | first= Vassilios
 | title=The Conquest of Crete by the Arabs (ca. 824): A Turning Point in the Struggle between Byzantium and Islam
 | year=1984
 | publisher=[[Academy of Athens (modern)|Academy of Athens]]
 | oclc=14344967
}}
* {{citation
 |first   = Salvatore
 |last    = Cosentino
 |title   = Constans II and the Byzantine navy
 |journal = [[Byzantinische Zeitschrift]]
 |volume  = 100
 |issue   = 2
 |year    = 2008
 |pages   = 577–603
 |issn    = 0007-7704
 |doi     = 10.1515/BYZS.2008.577
|s2cid = 192015598
 }}
* {{citation
 | title = The Alexiad
 | editor-last = Dawes
 | editor-first = Elizabeth A.
 | publisher = Routledge & Kegan Paul
 | location = London
 | year = 1928
 | url=http://www.fordham.edu/halsall/basis/AnnaComnena-Alexiad.html
 }}
* {{citation
 | first = James P
 | last = Delgado
 | editor1-last = Catsambis
 | editor1-first = Alexis
 | editor2-last = Ford
 | editor2-first = Ben
 | editor3-last = Hamilton
 | editor3-first = Donny L.
 | contribution = Ships on Land
 | title = The Oxford Handbook of Maritime Archaeology
 | year = 2011
 | pages = 182–191
 | publisher = Oxford University Press
 | isbn = 978-0-19-537517-6
 }}
* {{citation
 | first = R. H.
 | last = Dolley
 | title = The Warships of the Later Roman Empire
 | journal = The Journal of Roman Studies
 | volume = 38
 | year = 1948
 | issue = 1–2
 | pages = 47–53
 | doi = 10.2307/298170
 | publisher = Society for the Promotion of Roman Studies
 | jstor = 298170
 | s2cid = 162710370
 }}
* {{The Age of the Galley | last = Dotson | first = John E. | chapter = Economics and Logistics of Galley Warfare | pages = 218–223}}
* {{citation
 | first = John
 | last = Dotson
 | chapter = Venice, Genoa and Control of the Seas in the Thirteenth and Fourteenth Centuries
 | title = War at Sea in the Middle Ages and the Renaissance
 | editor1-last = Hattendorf
 | editor1-first = John B.
 | editor1-link = John Hattendorf
 | editor2-last = Unger
 | editor2-first = Richard W.
 | pages = 109–136
 | publisher = Boydell Press
 | year = 2003
 | chapter-url={{Google Books|YVbAwbQrJtAC|page=119|plainurl=y}}
 | isbn = 0-85115-903-6
 }}
* {{citation
 | first = Albert
 | last = Failler
 | title = L'inscription de l'amiral dans la liste des dignités palatines
 | journal = Revue des études byzantines
 | volume = 61
 | year = 2003
 | pages = 229–239
 | language = fr
 | doi = 10.3406/rebyz.2003.2279
 | url = http://www.persee.fr/web/revues/home/prescript/article/rebyz_0766-5598_2003_num_61_1_2279
 | access-date = 29 May 2011
 }}
* {{Emperor Michael Palaeologus and the West}}
* {{Recherches sur les institutions byzantines
 | volume = I
 | chapter = Le Drongaire de la flotte, le Grand drongaire de la flotte, le Duc de la flotte, le Mégaduc
 | pages = 535–562
}}
* {{Warfare, State and Society in the Byzantine World, 565–1204}}
* {{cite book
 | last = Halm
 | first = Heinz
 | translator = Michael Bonner
 | title = The Empire of the Mahdi: The Rise of the Fatimids
 | series = Handbook of Oriental Studies
 | volume = 26
 | publisher = Brill
 | location = Leiden
 | year = 1996
 | isbn = 9004100563
 | url = {{Google Books|usUjj9OV9l0C|plainurl=y}}
 }}
* {{citation
 | first = Jonathan
 | last = Harris
 | title = Byzantium and The Crusades
 | publisher = Hambledon & London
 | year = 2006
 | isbn = 978-1-85285-501-7
 }}
* {{citation
 | first = Ian
 | last = Heath
 | title = Armies of the Middle Ages, Volume 2: The Ottoman Empire, Eastern Europe and the Near East, 1300–1500
 | publisher = Wargames Research Group
 | year = 1984
 }}
* {{citation
 | first1 = Ian
 | last1 = Heath
 | last2 = McBride |first2=Angus
 | title = Byzantine Armies: AD 1118–1461
 | publisher = Osprey Publishing
 | year = 1995
 | isbn = 978-1-85532-347-6
 }}

* {{The Age of the Galley | last = Hocker | first = Frederick M. | chapter = Late Roman, Byzantine, and Islamic Galleys and Fleets | pages = 86–100}}

* {{citation

 | last1 = Ibn Khaldūn
 | author1-link = Ibn Khaldun
 | last2 = Rosenthal
 | first2 = Franz (Ed. & Transl.)
 | title = The Muqaddimah: An Introduction to History
 | publisher = Princeton University Press
 | year = 1969
 | isbn = 978-0-691-01754-9
 | url-access = registration
 | url = https://archive.org/details/muqaddimahintrod00ibnk
 }}
* {{citation
 | first = Romilly
 | last = Jenkins
 | title = Byzantium: The Imperial Centuries, AD 610–1071
 | publisher = University of Toronto Press
 | year = 1987
 | isbn = 0-8020-6667-4
 }}
* {{citation
 | last = Kastritsis
 | first = Dimitris
 | title = The Sons of Bayezid: Empire Building and Representation in the Ottoman Civil War of 1402-13
 | publisher = Brill
 | location = Leiden and Boston
 | year = 2007
 | isbn = 978-90-04-15836-8
 | url = {{Google Books|u_evCQAAQBAJ|plainurl=y}}
 }}
* {{Oxford Dictionary of Byzantium}}
* {{citation
 | last1 = Kekaumenos
 | author1-link = Kekaumenos
 | last2 = Tsoungarakis
 | first2 = Dimitris (Ed. & Transl.)
 | title = Στρατηγικὸν
 | publisher = Kanakis Editions
 | year = 1996
 | location = Athens
 | isbn = 960-7420-25-X
 | pages = 268–273
 }}
* {{citation
 | first = Angeliki E.
 | last = Laiou
 | author-link = Angeliki Laiou
 | title = Constantinople and the Latins: The Foreign Policy of Andronicus II, 1282–1328
 | publisher = Harvard University Press
 | year = 1972
 | isbn = 0-674-16535-7
}}
* {{citation
 | first = Frederic Chapin
 | last = Lane
 | title = Venice, a Maritime Republic
 | publisher = Jons Hopkins University Press
 | year = 1973
 | isbn = 978-0-8018-1460-0
 }}
* {{citation
 | last1 = Lewis
 | first1 = Archibald Ross
 | last2 = Runyan
 | first2 = Timothy J.
 | title = European Naval and Maritime History, 300–1500
 | publisher = Indiana University Press
 | year = 1985
 | isbn = 0-253-20573-5
 }}
* {{citation
 | last = Loenertz
 | first = Raymond-Joseph
 | author-link = Raymond-Joseph Loenertz
 | title = Notes d'histoire et de chronologie byzantines
 | year = 1959
 | journal = Revue des études byzantines
 | volume = 17
 | url = http://www.persee.fr/web/revues/home/prescript/article/rebyz_0766-5598_1959_num_17_1_1204
 | pages = 158–167
 | language = fr
 | doi=10.3406/rebyz.1959.1204
}}
* {{citation
 | first = Michael
 | last = MacCormick
 | title = Origins of the European Economy: Communications and Commerce, A.D. 300–900
 | publisher = Cambridge University Press
 | year = 2002
 | isbn = 978-0-521-66102-7
 }}
* {{citation
 | first=Penny
 | last=MacGeorge
 | title=Late Roman Warlords
 | year=2002
 | publisher=Oxford University Press
 | isbn=978-0-19-925244-2
 | chapter = Appendix: Naval Power in the Fifth Century
 }}
* {{citation
 | last=Macrides
 | first=Ruth
 | title=George Akropolites: The History – Introduction, Translation and Commentary
 | publisher=Oxford University Press
 | year=2007
 | isbn=978-0-19-921067-1
 | url={{Google Books|v_0LdWboHXwC|plainurl=y}}
}}
* {{The Empire of Manuel I Komnenos}}
* {{citation
 | first=Christos G.
 | last=Makrypoulias
 | title=The Navy in the Works of Constantine Porphyrogenitus
 | journal=Graeco-Arabica
 | issue=6
 | year=1995
 | location=Athens
 | pages=152–171
 }}
* {{cite journal |last1=McMahon |first1=Lucas |title=Logistical modelling of a sea-borne expedition in the Mediterranean: the case of the Byzantine invasion of Crete in AD 960 |journal=Mediterranean Historical Review |date=2021 |volume=36 |issue=1 |pages=63–94 |doi=10.1080/09518967.2021.1900171|s2cid=235676141 }}
* {{citation
 | first = Cyril
 | last = Mango
 | author-link = Cyril Mango
 | title = The Oxford History of Byzantium
 | publisher = Oxford University Press
 | year = 2002
 | isbn = 0-19-814098-3
 }}
* {{Byzantium and Venice: A Study in Diplomatic and Cultural Relations}}
* {{The Last Centuries of Byzantium, 1261–1453|edition=Second}}
* {{citation
 | first = David
 | last = Nicolle
 | title = Medieval Warfare Source Book: Christian Europe and its Neighbours
 | publisher = Brockhampton Press
 | year = 1996
 | isbn = 1-86019-861-9
 }}
* {{citation
 | first = David
 | last = Nicolle
 | title = Constantinople 1453: The End of Byzantium
 | publisher = Praeger Publishers
 | year = 2005
 | isbn = 978-0-275-98856-2
 }}
* {{citation
 | first = John Julius
 | last = Norwich
 | author-link = John Julius Norwich
 | title = Byzantium: The Early Centuries
 | publisher = Penguin Books
 | year = 1990
 | isbn = 978-0-14-011447-8
 }}
* {{citation
 | first = John Julius
 | last = Norwich
 | author-link = John Julius Norwich
 | title = Byzantium: The Decline and Fall
 | publisher = Penguin Books
 | year = 1996
 | isbn = 978-0-14-011449-2
 }}
* {{citation
 | first = John Julius
 | last = Norwich
 | author-link = John Julius Norwich
 | title = Byzantium: The Apogee
 | publisher = Penguin Books
 | year = 1999
 | isbn = 978-0-14-011448-5
 }}
* {{citation
 | first = Patrice
 | last = Pomey
 | title = The Kelenderis Ship: A Lateen Sail
 | journal = The International Journal of Nautical Archaeology
 | volume = 35
 | issue = 2
 | year = 2006
 | pages = 326–329
 | doi = 10.1111/j.1095-9270.2006.00111.x
 | bibcode = 2006IJNAr..35..326P
 | s2cid = 162300888
 }}
* {{citation
 | first = Jonathan
 | last = Phillips
 | title = The Fourth Crusade and the sack of Constantinople
 | publisher = Viking
 | year = 2004
 | isbn = 978-0-14-303590-9
 }}
* {{citation
 | first = John H.
 | last = Pryor
 | title = Geography, Technology, and War: Studies in the Maritime History of the Mediterranean, 649–1571
 | publisher = Cambridge University Press
 | year = 1988
 | isbn = 0-521-42892-0
 }}
* {{The Age of the Galley | last = Pryor | first = John H. | chapter = From Dromōn to Galea: Mediterranean Bireme Galleys AD 500–1300 | pages = 101–116 | ref={{harvid|Pryor|1995a}}}}
* {{The Age of the Galley | last = Pryor | first = John H. | chapter = The Geographical Conditions of Galley Navigation in the Mediterranean | pages = 206–217 | ref={{harvid|Pryor|1995b}}}}
* {{citation
 | first = John H.
 | last = Pryor
 | chapter = Byzantium and the Sea: Byzantine Fleets and the History of the Empire in the Age of the Macedonian Emperors, c. 900–1025 CE
 | title = War at Sea in the Middle Ages and the Renaissance
 | editor1-last = Hattendorf
 | editor1-first = John B.
 | editor1-link = John Hattendorf
 | editor2-last = Unger
 | editor2-first = Richard W.
 | pages = 83–104
 | publisher = Boydell Press
 | year = 2003
 | isbn = 0-85115-903-6
 }}
* {{citation
 | first1 = John H.
 | last1 = Pryor
 | last2= Jeffreys
 | first2 = Elizabeth M.
 | title = The Age of the ΔΡΟΜΩΝ: The Byzantine Navy ca. 500–1204
 | publisher = Brill Academic Publishers
 | year = 2006
 | isbn = 978-90-04-15197-0
 }}
* {{cite journal | last = Pryor | first = John H. | title = A View from the Masthead: The First Crusade from the Sea | pages = 87–152 | journal = Crusades | volume = 7 | year = 2008 | editor-first1 = Benjamin Z. | editor-last1 = Kedar | editor-first2 = Jonathan S.C. | editor-last2 =  Riley-Smith | editor-first3 = Jonathan | editor-last3 = Phillips | publisher = Ashgate Publishing | doi = 10.1080/28327861.2008.12220214 | issn = 1476-5276}}
* {{The Age of the Galley | last = Rankov | first = Boris | chapter = Fleets of the Early Roman Empire, 31 BC–AD 324 | pages = 78–85}}
* {{citation
 | first = Steven
 | last = Runciman
 | author-link = Steven Runciman
 | title = Byzantine Civilisation
 | journal = Nature
 | volume = 134
 | issue = 3395
 | pages = 795
 | publisher = Taylor & Francis
 | year = 1975
 | isbn = 978-0-416-70380-1
 | bibcode = 1934Natur.134S.795.
 | doi = 10.1038/134795c0
 | s2cid = 4118229
 }}
* {{citation
 | first = Michael P.
 | last = Scafuri
 | title = Byzantine Naval Power and Trade: The Collapse of the Western Frontier
 | publisher = Texas A & M University
 | url = http://nautarch.tamu.edu/Theses/pdf-files/Scafuri-MA2002.pdf
 | year = 2002
 }}
* {{The Papacy and the Levant | volume = 2}}
* {{citation
 | first=Shaun
 | last=Tougher
 | title=The Reign of Leo VI (886–912): Politics and People
 | year=1997
 | publisher=Brill
 | isbn=90-04-09777-5
 }}
* {{A History of the Byzantine State and Society}}
* {{citation
 | title=Byzantium and Its Army, 284–1081
 | last=Treadgold
 | first=Warren T.
 | author-link = Warren Treadgold
 | year=1998
 | publisher=Stanford University Press
 | isbn=0-8047-3163-2
 }}
* {{citation
 | editor-last= Turtledove
 | editor-first = Harry
 | editor-link = Harry Turtledove
 | title = The chronicle of Theophanes: an English translation of ''anni mundi'' 6095–6305 (A.D. 602–813)
 | publisher = University of Pennsylvania Press
 | year = 1982
 | url = {{Google Books|lK5wIPb4Vi4C|plainurl=y}}
 | isbn = 978-0-8122-1128-3
 }}
* {{citation
 | title=Byzantium and the Crusader States: 1096–1204
 | last=Lilie
 | first=Ralph-Johannes
 | year=1994
 | publisher=Oxford University Press
 | isbn=0-19-820407-8
 }}
* {{cite book
 | editor-first = Jean
 | editor-last = Verpeaux
 | language=fr
 | title = Pseudo-Kodinos, Traité des Offices
 | location = Paris
 | publisher = Centre National de la Recherche Scientifique
 | year = 1966
}}
* {{citation
 | title=The fall of Rome and the end of civilization
 | last = Ward-Perkins
 | first = Bryan
 | author-link = Bryan Ward-Perkins
 | publisher = Oxford University Press
 | year = 2005
 | isbn = 978-0-19-280728-1
}}
{{refend}}

==Further reading==
{{refbegin|30em}}
* {{citation
 | last = Bibicou
 | first = Helène
 | title = Problèmes de la marine byzantine
 | journal =  Annales. Économies, Sociétés, Civilisations
 | language = fr
 | volume = 13
 | issue = 2
 | pages = 327–338
 | url = http://www.persee.fr/web/revues/home/prescript/article/ahess_0395-2649_1958_num_13_2_2743
 | doi=10.3406/ahess.1958.2743
 | year = 1958
 | s2cid = 245989631
 }}
* {{citation
 |first=Vassilios
 |last=Christides
 |contribution=Byzantine Dromon and Arab Shini: The Development of the Average Byzantine and Arab Warships and the Problem of the Number and Function of the Oarsmen
 |title=Tropis III, 3rd International Symposium on Ship Construction in Antiquity, Athens 1989 proceedings
 |year=1995
 |pages=111–122
 |publisher=Hellenic Institute for the Preservation of Nautical Tradition
 |url=http://ina.tamu.edu/library/tropis/volumes/3/Tropis%20III%20Proceedings%201989.pdf
 |url-status=dead
 |archive-url=https://web.archive.org/web/20120306070444/http://ina.tamu.edu/library/tropis/volumes/3/Tropis%20III%20Proceedings%201989.pdf
 |archive-date=2012-03-06
}}
* {{citation
 |first=Vassilios
 |last=Christides
 |contribution=Military Intelligence in Arabo-Byzantine Naval Warfare
 |title=Byzantium at War (9th–12th c.)
 |publisher=National Hellenic Research Foundation – Centre for Byzantine Research
 |editor-first=K.
 |editor-last=Tsiknakis
 |pages=269–281
 |year=1997
 |isbn=960-371-001-6
 |url=http://www.deremilitari.org/resources/pdfs/christides.pdf
 |url-status=dead
 |archive-url=https://web.archive.org/web/20110725230646/http://www.deremilitari.org/resources/pdfs/christides.pdf
 |archive-date=2011-07-25
}}
* {{cite journal|last=D’Amato|first=Raffaele|title=The Last Marines of Byzantium: ''Gasmouloi'', ''Tzakones'' and ''Prosalentai''. A Short History and a Proposed Reconstruction of their Uniforms and Equipment|journal=Journal of Mediterranean Studies|volume=19|issue=2|year=2010|pages=219–248|issn=2523-9465}}
* {{citation
 | first = R. H.
 | last = Dolley
 | title = Naval tactics in the heyday of Byzantine thalassocracy
 | journal = Atti dell' VIII Congresso internazionale di Studi bizantini
 | year = 1953
 | location = Rome
 | pages = 324–339
 | volume = I
 }}
* {{cite book
 | last = Eickhoff
 | first = Ekkehard
 | title = Seekrieg und Seepolitik zwischen Islam und Abendland: das Mittelmeer unter byzantinischer und arabischer Hegemonie (650-1040)
 | publisher = De Gruyter
 | year = 1966
 | language = de
}}
* {{citation
 | first1 = Zaraza
 | last1 = Friedman
 | first2 = Levent
 | last2 = Zoroglu
 | title = Kelenderis Ship&nbsp;– Square or Lateen Sail?
 | journal = The International Journal of Nautical Archaeology
 | volume = 35
 | issue = 1
 | year = 2006
 | pages = 108–116
 | doi = 10.1111/j.1095-9270.2006.00091.x
 | bibcode = 2006IJNAr..35..108F
 | s2cid = 108961383
 }}
* {{citation
 | first = Taxiarchis G.
 | last = Kollias
 | contribution = Die byzantinische Kriegsmarine. Ihre Bedeutung im Verteidigungssystem von Byzanz
 | language = de
 | editor-first = Evangelos K.
 | editor-last =Chrysos
 | title = Griechenland und das Meer. Beiträge eines Symposions in Frankfurt im Dezember 1996
 | location = Mannheim
 | year = 1999
 | pages = 133–140
 }}
* {{citation
 | first=George
 | last=Makris
 | editor-last=Laiou
 | editor-first= Angeliki E.
 | title=The Economic History of Byzantium from the Seventh through the Fifteenth Century
 | chapter=Ships
 | pages=91–100
 | year=2002
 | publisher=Dumbarton Oaks
 | isbn=0-88402-288-9
 }}
* {{citation
 | first = Dimitris
 | last = Michalopoulos
 | author2 = Milanos, Antonis
 | title = Ελληνικά Πλοία του Μεσαίωνα
 | trans-title = Greek Vessels of the Middle Ages
 | language = el
 | publisher = Evropi
 | year = 1994
 | isbn = 960-253-028-6
 }}
* {{cite journal |last=Morgan |first=Gareth |title=The Venetian Claims Commission of 1278 |journal=[[Byzantinische Zeitschrift]] |volume=69 |issue=2 |year=1976 |pages=411–438 |doi=10.1515/byzs.1976.69.2.411 |s2cid=159571822}}
{{refend}}

{{Byzantine Empire topics|state=collapsed}}

[[Category:Byzantine navy| ]]
[[Category:Military history of the Mediterranean]]
[[Category:Deforestation in Turkey]]