Answer
John Komnenos was the father of Alexios I, the Byzantine emperor who reigned from 1081 to 1118. John was a prominent general and statesman who served under Emperor Isaac I Komnenos. He played a key role in the overthrow of Isaac I and the accession of Alexios I to the throne. John's military and political skills helped to establish the Komnenian dynasty as a major force in Byzantine history.