His son was besieged by Dahhak and his Kharijites and Saffarids in Nasibin; but a fierce battle at Mardin ended in Merwan's favour (745).
The prefect of Damascus, Dahhak b.
Meanwhile Dahhak had declared himself openly for Ibn Zobair.
684) ensued at Merj Rahit, near Damascus, in which Dahhak and Zofar, though they had the majority of troops, were utterly defeated.
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.
Whilst Merwan besieged Homs, Dahhak returned to Mesopotamia and took Mosul, whence he threatened Nisibis, where Abdallah, the son of Merwan, maintained himself with difficulty.
746) the Khawarij were defeated; Dahhak and his successor Khaibari perished; the survivors were obliged to retire to Mosul, where they crossed the Tigris.