sentences:  In 1180 his former pupil Theodore Bar Wahbon had himself elected patriarch at Amida under the name of John by certain malcontent bishops, beginning a schism which lasted for thirteen years.Michael took energetic action, got hold of the anti-patriarch and locked him up at Bar Sauma and formally deposed him.Some of monks allowed Ibn Wahbon to escape, who fled to Damascus and tried in vain to appeal to Saladin.