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The megas doux (, , "grand duke") was one of the highest positions in the hierarchy of the later Byzantine Empire, denoting the commander-in-chief of the Byzantine navy. It is sometimes also given in English by the half-Latinizations megaduke or megadux. The Greek word δούξ is the Hellenized form of the Latin term dux, meaning leader or commander.
Initially, the office may have designated ad hoc commanders-in-chief placed in charge of combined naval and land expeditions, before coming to denote the head of the imperial fleet. John Doukas, the first known , led campaigns on both land and sea and was responsible for the re-establishment of firm Byzantine control over the Aegean Sea and the islands of Crete and Cyprus in the years 1092–93 and over western Anatolia in 1097. From this time the was also given overall control of the provinces of Hellas, the Peloponnese and Byzantine Crete, which chiefly provided the manpower and resources for the fleet. However, since the was one of the Empire's senior officials, and mostly involved with the central government and various military campaigns, de factο governance of these provinces rested with the provinces' or , and various local leaders. During the 12th century, the post of was dominated by the Kontostephanos family; one of its members, Andronikos Kontostephanos, was one of the most important officers of Emperor Manuel I Komnenos (), assisting him in achieving many land and naval victories.
With the virtual disappearance of the Byzantine fleet after the Fourth Crusade, the title was retained as an honorific in the Empire of Nicaea. Michael VIII Palaiologos () assumed the title when he became regent for John IV Laskaris (), before being raised to senior co-emperor. It was also used by the Latin Empire, where, in , the Latin emperor awarded the island of Lemnos and the hereditary title of megadux to the Venetian (or possibly of mixed Greek and Venetian descent) Filocalo Navigajoso ("imperiali privilegio Imperii Megaducha est effectus"). His descendants inherited the title and the rule of Lemnos until evicted by the Byzantines in 1278.
After the Byzantine recovery of Constantinople in 1261, the title reverted to its old function as commander-in-chief of the navy, and remained a high rank for the remainder of the empire, its holder ranking sixth after the emperor, between the and the . As such, it was also sometimes conferred upon foreigners in imperial service, the most notable among these being the Italian Licario, who recovered many Aegean islands for Emperor Michael VIII, and Roger de Flor, head of the Catalan Company. The mid-14th century Book of Offices of Pseudo-Kodinos lists the insignia of the as a golden-red hat decorated with embroideries in the style, without veil. Alternatively, a domed hat could be worn, again in red and gold and decorated with golden wire, with a portrait of the emperor standing in front, and another of him enthroned in the rear. The also wore a rich silk tunic, the kabbadion, and could choose the fabric himself "from those that are in use". His staff of office () featured carved knots and knobs in gold, bordered with silver braid. Pseudo-Kodinos also records that, while the other warships flew "the usual imperial flag" of the cross and the firesteels, the flagship of the flew an image of the emperor on horseback. His subordinate officials were the , the , the , a number of junior , and of junior .
The Serbian Empire, established in 1346 by Tsar Stefan Dushan, adopted various Byzantine titles, among them that of , which became the "grand voivode" (), albeit without any naval connotations. Holders of the office included senior noblemen such as Jovan Uglješa and Jovan Oliver.
| John Doukas | 1092 – unknown | Alexios I Komnenos | Brother-in-law of Alexios I, previously governor of Dyrrhachium. | |
| Landulf | 1099–1105 | Alexios I Komnenos | Admiral of Western origin. | |
| Isaac Kontostephanos | 1105–1108 | Alexios I Komnenos | Dismissed for his incompetence in the wars against Bohemond. | |
| Marianos Maurokatakalon | 1108 – unknown | Alexios I Komnenos | Successor of Isaac Konstostephanos. | |
| Eumathios Philokales | after 1112 – after 1118 | Alexios I Komnenos | Previously judicial official in Greece and long-time governor of Cyprus. | |
| Constantine Opos | Unknown | Alexios I Komnenos | Distinguished general in the campaigns against the Turks. | |
| Leo Nikerites | Unknown | Alexios I Komnenos | Eunuch, previously governor in Bulgaria and the Peloponnese. | |
| Nikephoros Vatatzes | Unknown | Alexios I Komnenos (?) | Known only through a seal, possibly dating to the reign of Alexios I. | |
| Stephen Kontostephanos | ca. 1145 (?) – 1149 | Manuel I Komnenos | Brother-in-law of Manuel I, was killed while in office in 1149. | |
| Alexios Komnenos | ca. 1155 – after 1161 | Manuel I Komnenos | Son of Anna Komnene and Nikephoros Bryennios the Younger. | |
| Andronikos Kontostephanos | after 1161 – 1182 | Manuel I Komnenos | Manuel's nephew, he was the emperor's most trusted and distinguished general. Blinded by the usurper Andronikos I Komnenos in 1182. | |
| John Komnenos | Unknown | Manuel I Komnenos | First cousin of Manuel I, son of the sebastokrator Andronikos Komnenos. He fell at Myriokephalon in 1176. | |
| Constantine Angelos Doukas | Unknown | Isaac II Angelos | and afterwards governor of Plovdiv, he led an unsuccessful usurpation attempt. | |
| Michael Stryphnos | ca. 1195 – after 1201/1202 | Alexios III Angelos | A favourite of Alexios III. He reportedly sold off the fleet's equipment to enrich himself. | |
| Theodotos Phokas | ca. 1210 | Theodore I Laskaris | Uncle of Theodore I, emperor of Nicaea, known only from a monastic property deed dating to between 1206 and 1212. | |
| John Gabalas | ca. 1240 | John III Vatatzes | A letter by King Henry I of Cyprus to the anonymous "great ruler of the God-guarded island of Rhodes and the Cyclades", identified by Spyridon Lambros with John, refers to him as pansebastos sebastos, megas doux, and gambros of the emperor. | |
| Michael Palaiologos | 1258 | John IV Laskaris | The future Michael VIII, he assumed the office after the murder of George Mouzalon in September 1258, when he was named regent for the young John IV. He was soon after raised to despotes and eventually to emperor. | |
| Michael Tzamantouros Laskaris | 1259 – ca. 1269/72 | Michael VIII Palaiologos | Brother of Theodore I Laskaris, due to his advanced age he never held actual command of the fleet. He held the office until his death. | |
| Alexios Doukas Philanthropenos | ca. 1272/73 – ca. 1274/75 | Michael VIII Palaiologos | Previously protostrator and de facto commander of the fleet since ca. 1263. Held the office of megas doux until his death. | |
| Licario | ca. 1275/77 – unknown | Michael VIII Palaiologos | Italian renegade who entered Byzantine service, he conquered Negroponte and many of the Aegean islands. | |
| John de lo Cavo | after 1278 | Michael VIII Palaiologos | Genoese privateer who entered Byzantine service, lord of Anafi and Rhodes. | |
| Roger de Flor | 1303–1304 | Andronikos II Palaiologos | Leader of the mercenary Catalan Company. He resigned his post in late 1304 favour of his lieutenant, Berenguer d'Entença, and was murdered a few months later. | |
| Berenguer d'Entença | 1304–1305 | Andronikos II Palaiologos | Roger de Flor's lieutenant and successor as leader of the mercenary Catalan Company. He resigned his office after disagreeing with the emperor | |
| Fernand Ximenes de Arenos | 1307/1308 – unknown | Andronikos II Palaiologos | One of the leaders of the Catalan Company, he was named megas doux defected to the Byzantines | |
| Syrgiannes Palaiologos | 1321–1322 or 1328/29 | Andronikos II Palaiologos | One of the main partisans of the young Andronikos III Palaiologos in the Byzantine civil war of 1321–1328, he defected to the aged Andronikos II, who rewarded him with the office of megas doux. After plotting against him as well, he was imprisoned. | |
| Isaac Palaiologos Asanes | unknown – 1341 | Andronikos III Palaiologos | Promoted to panhypersebastos, and replaced in office by Alexios Apokaukos. | |
| Alexios Apokaukos | 1341–1345 | Andronikos III Palaiologos John V Palaiologos | A former partisan and protégé of John Kantakouzenos, Apokaukos was instrumental in the outbreak of the Byzantine civil war of 1341–1347, and until his murder in 1345 led the anti-Kantakouzenist regency for John V | |
| Asomatianos Tzamplakon | 1348–1349 | John VI Kantakouzenos | Head of the fleet during the Byzantine–Genoese war of 1348–1349. He died some time before 1356 | |
| Paul? Mamonas | after 1393/94 – before 1416/17 | Manuel II Palaiologos | The Mamonas family were hereditary rulers of Monemvasia. Paul Mamonas ruled the city between 1384 and 1416/17 | |
| Manuel | unknown – 1410 | Manuel II Palaiologos | Mentioned only in an anonymous chronicle as dying of an epidemic in 1409/10 | |
| Manuel? Phrangopoulos | ca. 1429 | Theodore II Palaiologos | Promoted from protostrator to megas doux of the Despotate of the Morea in 1429. Manuel Phrangopoulos was a senior official of the Despotate already since the 1390s. | |
| Paraspondelos | ca. 1436 | John VIII Palaiologos | Known only as the father-in-law of Demetrios Palaiologos. | |
| Loukas Notaras | after 1441 – 1453 | John VIII Palaiologos Constantine XI Palaiologos | A wealthy merchant and landowner with estates in Italy, Notaras served as ship captain in 1441, and then under both John VIII and Constantine XI as chief minister ( mesazon). He was executed by the Ottomans after the Fall of Constantinople | |
| Lekes Tzatzintzaios | unknown–1332 | Executed by Basil Megas Komnenos on his arrival to Trabzon. | ||
| John | 1332–1344 | Basil Megas Komnenos Irene Palaiologina | Eunuch and one of the leading participants in the Trapezuntine Civil War on the side of Empress Irene Palaiologina. | |
| Niketas Scholarios | 1344–1345 1349–1361 | John III Megas Komnenos Michael Megas Komnenos Alexios III Megas Komnenos | One of the leading participants in the Trapezuntine Civil War, as a partisan of John III Megas Komnenos. Imprisoned by Michael Megas Komnenos in 1345, he was reinstated by Michael in 1349 and remained in office under Alexios III, probably until his death in 1361. | |
| John Kabazites | after 1344 – 1349 | Michael Megas Komnenos | One of the leading participants in the Trapezuntine Civil War against Empress Irene Palaiologina. Killed fighting against the Genoese at Kaffa. | |
| Scholaris | ca. 1395 | Otherwise unknown/unidentified. | ||
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