Husayn ibn Ali was the grandson of the Prophet Muhammad and the son of Ali ibn Abi Talib and Fatimah. He is a significant figure in Islamic history, particularly in Shia Islam, where he is revered as a martyr and a symbol of resistance against tyranny. His life and actions are often associated with the principles of justice and righteousness. 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 I. This event is commemorated annually during Ashura, a day of mourning for Shia Muslims, highlighting Husayn's sacrifice and the struggle for justice.