II. The Second Imam, al-Hasan (3/62 -50/670)
He was the elder son of 'Ali by the Prophet's daughter Fatimah. He laid claim to the caliphate for some six months after the death of his father, but was finally forced to surrender it to Mu'awiyah. For the rest of his life he lived in Medina in seclusion. He is buried in the Baq'i cemetery in Medina.