Umayyad tradition of cursing Ali
…Rashidun caliph Uthman (r. 644–656), who was assassinated by rebels from the provinces angered by his policies. Ali and Mu'awiya fought the inconclusive Battle of Siffin in 657 CE and continued hostilities until the assassination of Ali in 661, which paved the way for Mu'awiya to takeover the caliphate in the same year…