III. The Third Imam, al-Husayn (4/62 -6I/680)
The younger son of 'Ali by Fatimah, like his brother he lived most of his life quietly in Medina under the watchful eyes of the caliph's officials and spies. When Mu'awiyah's son Yazid became caliph, he demanded allegiance from al-Husayn, who refused to give it. Finally al-Husayn felt it necessary to go into battle against Yazid to protest against the injustices which were being carried out in the name of Islam. He and a small group of followers including most of his immediate family were cruelly massacred at Karbala The day of his martyrdom (" 'Ashura ") has become the most solemn day of the Shi'ite calendar, marked by processions and universal mourning. Its celebration symbolizes the whole ethos of Shi'ism. He is buried in Karbala in Iraq.