Husayn ibn Ali (11 or 13 January 626 CE – 13 October 680 CE) was the third Imam of Shia Islam. He was the son of Ali ibn Abi Talib, the fourth Caliph and first Imam of Shia Islam. His mother was Fatimah Zahra, the daughter of the Prophet Muhammad and wife of Ali. He was also the younger brother of Hasan ibn Ali, the second Imam of Shia Islam.