Description acceptable. After this multi-year campaign, a prince on the losing side supposedly ran for his life after horsemen left the decapitated body of his brother to rot near a river. The rise of Qaysites like al-Hajjaj ibn Yusuf in the lead-up to this campaign prompted the Yamanites to supply the bulk of its victorious army. This campaign’s victors swore allegiance to al-riḍā, a title which al-Ḥārith ibn Surayj had earlier invoked during his rebellion against the governor Naṣr ibn Sayyār. A leader during this campaign granted himself the title (*) as-Saffah upon entering Kufa. The combination of harsh kharaj and jizya taxes prompted mawālī to band together under the Black Standard (10[1])during this campaign, (10[2])which began in Khorasan. (10[1])This campaign ended with Abu Muslim’s victory at the Battle of Zab. For 10 points, name this event that resulted in the creation of the caliphate that succeeded the Umayyads. ■END■