Husayn ibn Ali was the grandson of the Prophet Muhammad and the son of Ali ibn Abi Talib and Fatimah, the Prophet's daughter. He is a significant figure in Islam, particularly in Shia tradition, where he is revered as a martyr and a symbol of resistance against tyranny. Husayn is best known for his role in the Battle of Karbala in 680 CE, where he and his followers were killed while opposing the Umayyad caliph Yazid. This event is commemorated annually during Ashura, highlighting themes of sacrifice, justice, and standing up against oppression.