Theodore was the son of general and protosebastosAlexios Branas and of Anna Komnene Vatatzina. He was probably born in Adrianople, where his family held hereditary lands. He was a descendant of the imperial dynasty of the Komnenoi through both his parents, and was a great-nephew of Manuel I Komnenos. His father, who defeated the Siculo-Norman invasion of Byzantium at the Battle of Demetritzes, was killed in 1187 when leading a rebellion against Isaac II Angelos. In 1193, according to the chronicler Alberic of Trois-Fontaines, Theodore became the lover of the dowager empressAnna, then aged 22. She was the daughter of King Louis VII of France by his third wife Adèle of Champagne, and the sister of Philip II of France. She had originally come to Constantinople to be married to Alexios II Komnenos, but Alexios was murdered by his co-emperor and regent Andronikos I Komnenos in 1183. She was then married to Andronikos, and was again widowed on his violent death in 1185. Though of French birth, Anna became thoroughly Byzantine in culture and Greek in language; she insisted on employing an interpreter when talking to a party of crusaders, claiming to have completely forgotten the French language. Theodore fought with limited success under Isaac II Angelos. As the commander of the Alan mercenaries, he was the only Byzantine leader to resist the German crusaders in a clash at Prousenos near Philippopolis in 1189. Together with John Petraliphas, Michael Kantakouzenos and others, he was involved in the successful plot to replace Isaac with his brother Alexios III Angelos in 1195. He fought against various enemies under Alexios III, and was appointed doux of the thema of Adrianople and Didymoteichon. He was prominent in the initial defence of Constantinople against the Fourth Crusade, in 1202-1203.
Life after 1204, under Latin rule
After the fall of Constantinople in 1204 Theodore seems to have speedily come to an accommodation with the new Latin regime. Theodore and Anna married, the date of their marriage is unknown, they had at least one daughter, who married Narjot de Toucy. For several years after 1204 Theodore, and presumably Anna, were of invaluable assistance to the Empire. Theodore was one of the few notable Greeks to offer it his immediate support, and, possibly in 1206, received the title of Caesar in return. Branas was a leader, under Alexios Aspietes, of the Greek party in Philippopolis in opposition to the rule of the Bulgarian TsarKaloyan.. He managed to escape the violent sacking of the city by the Bulgarians, after which Aspietes was executed. Being an avowed anti-Bulgarian Greek and a native of Thrace, he developed even closer ties with the Latins, who were the only force actively confronting the Bulgarian Tsar. Kaloyan's destructive ruthlessness was a major cause of Greek desertions to the Latins. Choniates states that Branas was elected the leader of Greek troops who had made peace with the Latin regime in Constantinople. In 1206 Theodore Branas acted as a mediator between Henry of Flanders and the Greeks of Adrianople and Didymoteichon, who were menaced by the Bulgarians and wished to seek Latin protection for their cities. Branas was given command of the garrison of Adrianople, consisting of local Greek troops and 40 Latin knights, and later unsuccessfully defended Didymoteichon when it was besieged and sacked by Kaloyan. In spring of 1207 Kaloyan went on the offensive again, and laid siege to Adrianople itself. The siege was abandoned even before a relief force from Constantinople arrived. A joint Latin and Adrianopolitan army, under Emperor Henry, then raided Bulgarian territory. Theodore was Lord of Adrianople, Didymoteichon and Apros. The Pactum Adrianopolitanum dating to 1206, records the recognition by Marino Zeno, Venetian Podestà of Constantinople, of the right of "the hereditary ruler and captain, most worthy Caesar, most noble Komnenos, lord Theodore Branas", to govern Adrianople and its territories according to the customs of the Greeks. The lordship was feudal in nature, Branas as his service was to provide Venice with 500 cavalry when required. Venice, in turn was obliged to support Branas and the Adrianopolitans against all enemies. However, Branas held the town of Apros directly from the Latin emperor, and the dependency of the other territories on Venice was entirely theoretical. The last record of Theodore Branas is in 1219, when, like his son-in-law Narjot de Toucy, he briefly governed Constantinople.
Legacy
Theodore Branas was succeeded as Lord of Adrianople by Baldwin of Béthune, probably a son of Baldwin of Béthune, titular Count of Aumale. As the lordship was hereditary it is assumed that Baldwin married an otherwise unattested daughter of Branas. Baldwin was a relative of Cono of Béthune who held the Byzantine titles of protovestiarios and sebastokrator. The Branas family in the later 13th century held extensive estates around Smyrna in Anatolia, they seem to have returned fully into Byzantine society and Theodore's granddaughter Irene married into the imperial family of the Palaiologoi.
