Berber Revolt
Berber patience finally broke in 740, in what became known as the Great Berber Revolt. It began with an uprising in Tangiers against Ubayd Allah's tax-collectors and raiders. Fired up by Sufrite (Kharijite) activists, the Berber tribes of western Morocco (the Ghomara, Miknasa and Berghwata) formed a coalition and acclaimed the Berber chieftain Maysara al-Matghari as 'caliph'. Tangiers fell into the hands of the Berber rebels hands, and soon enough the entire length of Morocco, from the Straits down to the Sous. Ubayd Allah's own son, Ismail, then a governor in the Sous, was killed by the rebels.