Original: 680 & ndash; Battle of Karbala: Hussain bin Ali, the grandson of the Prophet Muhammad, is decapitated by forces under Caliph Yazid I/O. This is commemorated by Muslims as Aashurah.
Simplified: 680 - Battle of Karbala: Shia Imam Husayn bin Ali, the grandson of the Prophet Muhammad, was decapitated by forces under Caliph Yazid I/O. This is commemorated by Shia Muslims as Aashurah.