The general disorder after the death of Hisham had given to the Khawarij an opportunity of asserting their claims such as they had never had before.
Jomhur was the first to pass over to the Khawarij; then Ibn Omar himself took the oath of allegiance.
That a noble Koreishite, a prince of the reigning house, should pledge himself to follow Dahhak the Shaibanite as his Imam, was an event of which the Khawarij were very proud.
Hisham also had gone over to the Khawarij, who now numbered i 20,000 men.
746) the Khawarij were defeated; Dahhak and his successor Khaibari perished; the survivors were obliged to retire to Mosul, where they crossed the Tigris.