[1] When the latter rose in revolt in the winter of 906/7, possibly due to the machinations of the powerful eunuch Samonas, Gregoras, who at the time held the supreme military position of Domestic of the Schools, was sent by Emperor Leo VI the Wise (reigned 886–912) to confront the Doukai, who had taken refuge in the fortress of Kabala near Ikonion.
Andronikos however called upon the Arabs for aid, and in spring of 907, an army under the Abbasid governor of Tarsus, Rustam ibn Baradu, arrived to help him.
[1] At a later point, but no later than the reign of Leo's brother and successor, Alexander (r. 912–913), Gregoras Iberitzes rose to the supreme court rank of magistros.
As a result, he is possibly to be identified with the nameless magistros who in late 912 delivered letters from the emperor and Patriarch Nicholas I Mystikos to Pope Anastasius III.
The usurpation attempt failed with the death of Constantine in the ensuing melee at the imperial palace, whereupon Gregoras and Leo Choirosphaktes sought sanctuary in the Hagia Sophia.