Theophylact Dalassenos (Greek: Θεοφύλακτος Δαλασσηνός; born before c. 990 – after 1039) was a Byzantine aristocrat who occupied a series of senior military positions in the 11th century.
[2][3] In August 1022, Emperor Basil II (reigned 976–1025) appointed him strategos (military governor) of the Anatolic Theme and gave him money to raise troops, with the task of suppressing the rebellion of Nikephoros Xiphias and Nikephoros Phokas Barytrachelos.
[3][6][7] Emperor Michael IV the Paphlagonian (r. 1034–41) however suspected the Dalassenoi of conspiring to usurp the throne; Theophylact's career therefore probably ended in 1034, and the entire family was banished in August 1039.
[3][8] Another seal records that he held the supreme court rank of magistros as well, but it is unclear whether this was already before 1034 or whether he was awarded it after Michael IV's death.
[3][8] Theophylact was most likely the father of Adrianos, the maternal grandfather of Anna Dalassene, the mother of Emperor Alexios I Komnenos, founder of the Komnenian dynasty.