The family's name derives from their ancestral home, the city of Dalassa, modern Talas in eastern Turkey.
[3][4] His sons also reached senior offices: two of them, Constantine and Theophylaktos, also occupied the post of doux of Antioch, while Romanos Dalassenos was katepano of Iberia.
This led to repressive measures and the imprisonment and exile of most of the family by Michael IV's minister John the Orphanotrophos.
[1][11] The admiral Constantine Dalassenos played a significant role in the early reign of Alexios I Komnenos, but most members of the family known thereafter are civil officials.
The most prominent of the 12th-century Dalassenoi was John Dalassenos Rogerios, who was named Caesar circa 1138 and led an unsuccessful conspiracy against Manuel I Komnenos (r.