Imam Reza (Ali ibn Musa) was the son of the seventh Imam and according to well-known accounts was born in 148/765 and died in 203/817. The eight Imam reached the imamate, after the death of his father, through Divine Command and the decree of his forefathers. The period of his imamate coincided with the caliphate of Harun and then his sons Amin and Ma'mun. After the death of his father, Ma'mun fell into conflict with his brother Amin which led to bloody wars and finally the assassination of Amin, after which Ma'mun became caliph. Until that day the policy of the Abbasid caliphate toward the Shi'ites had been increasingly harsh and cruel. Every once in a while one of the supporters of Ali (alawis) would revolt, causing blood wars and rebellions which were of great difficulty and consequence for the caliphate.