Background
He was married to an unnamed daughter of Isaac Angelos Doukas, uncle to the emperor Isaac II Angelos (reigned 1185–1195 and 1203–1204).
He was married to an unnamed daughter of Isaac Angelos Doukas, uncle to the emperor Isaac II Angelos (reigned 1185–1195 and 1203–1204).
Revolt of Theodore Mankaphas
Basil Vatatzes successfully suppressed the revolt of the usurper Theodore Mankaphas. The rebellion started circa 1188, when Theodore proclaimed himself as emperor in Philadelphia, Asia Minor, in opposition to Isaac II Angelos. After some initial skirmishes, in June 1189 Theodore was besieged in Philadelphia by imperial troops led by the emperor himself, who agreed to pardon Mankaphas as the latter submitted himself to Isaac and abandoned his aspirations to the throne.
He was then allowed to retain control of Philadelphia as its governor.
In circa 1193 (or possibly 1190), however, in his capacity of doux of the Thracesian Theme and Domestic of the East (or perhaps as Grand Domestic of the Byzantine army), Basil Vatatzes was sent against Theodore Mankaphas, who had rebelled once more. This time Vataztes effectively ended the rebellion and forced the usurper to flee to the court of the Seljuk Turks at Iconium.
Bulgarian Rebellion
At some time before 1193 he was appointed Domestic of the West (as with his contemporary and co-commander, Alexios Gidos, it is unclear if he was Grand Domestic or simply Domestic), based at Adrianople. His primary task was to stop the incursions of the Bulgarians from the north of the Balkan mountains toward the European themes of the empire.
In 1194 he was killed fighting against the Bulgarians in the Battle of Arcadiopolis.
He was probably the father of John III Doukas Vatatzes, the future Emperor of Nicaea, and of the sebastokrator Isaac Doukas Vatatzes.