Husayn ibn Ali was an Alid political and religious leader. The grandson of the Islamic prophet Muhammad and a son of Ali ibn Abi Talib and Muhammad's daughter Fatima, as well as a younger brother of Hasan ibn Ali, Husayn is regarded as the third Imam in Shia Islam after his brother, Hasan, and before his son, Ali al-Sajjad. Being the grandson of the prophet, he is the member of the ahl al-bayt. He is also considered to be a member of the Ahl al-Kisa, and a participant in the event of the mubahala. Muhammad described him and his brother, Hasan, as the leaders of the youth of Paradise.

Mu'awiya I was the founder and first caliph of the Umayyad Caliphate, ruling from 661 until his death. He became caliph less than thirty years after the death of the Islamic prophet Muhammad and immediately after the four Rashidun ('rightly-guided') caliphs. Unlike his predecessors, who had been close, early companions of Muhammad, Mu'awiya was a relatively late follower of Muhammad.