The 11th-century Byzantine historian
Michael Psellos reported that the Komnenos family originated from the village of Komne, in southern
Thrace—usually identified with the "Fields of Komnene" () near
Adrianople mentioned in the 14th century by
John Kantakouzenos, or further south at Komniana () according to Varzos—a view commonly accepted by modern scholarship. The first known member of the family,
Manuel Erotikos Komnenos, acquired extensive estates at
Kastamon in
Paphlagonia, which became the stronghold of the family in the 11th century. The family thereby quickly became associated with the powerful and prestigious military aristocracy () of
Asia Minor, so that despite coming from Thrace it came to be considered "eastern". Aside from deriving legitimacy as rulers from familial links to the prominent
Doukai (emperors
Constantine X and
Michael VII in particular), they also had a tradition linking them to
Claudius Gothicus, the supposed grandfather of
Constantine the Great. Many classical monuments dedicated to Claudius stood in the vicinity of
Kastra Komnenon, which according to historian Maximilian C. G. Lau may have increased his appeal in the eyes of the Komnenoi. The 17th-century French scholar
du Cange suggested that the family descended from a Roman noble family that followed Constantine the Great to
Constantinople, from whose cousin but although such mythical genealogies were common—and are attested for the closely related Doukas clan as well—the complete absence of any such assertion in the Byzantine sources argues against Du Cange's view. The Romanian historian
George Murnu suggested in 1924 that the Komnenoi were of
Aromanian descent, but this view too is now rejected. Modern scholars consider the family to have been entirely of
Greek origin. Manuel Erotikos Komnenos was the father of
Isaac I Komnenos (), and grandfather, through Isaac's younger brother
John Komnenos, of
Alexios I Komnenos (). ==Founding the dynasty==