1002, and became a general during the reign of Constantine X. He backed Isaac I Komnenos in his successful attempt to seize the throne, serving a prominent role during the Battle of Petroe. In 1078, he revolted against Emperor Michael VII, claiming the throne for himself, with the support of the Seljuk Turks. Michael VII, faced also with the revolt of Nikephoros Bryennios, chose to abdicate to Nikephoros III.