When Yazid ibn Muawiyah (Arabic:يزيد بن معاوية بن أبي سفيان) became Umayyad Caliph in 680 CE he faced two major crises. First was the dissent of Husayn ibn Ali (Arabic:حسين بن علي بن أبي طالب) and the other was the revolt of Abdullah ibn Zubayr (Arabic:عبد الله بن الزبير). Husayn ibn Ali rejected the legitimacy of Yazid ibn Muawiyah as Caliph, which ultimately led to his death in the Battle of Karbala on October 10, 680. This event further deepened the schism between Sunni and Shia denominations.