The sixth Imam, Abu ‘Abd Allah Ja’far, the eldest son of Muhammad al-Baqir, was born in Medina either in 80/690 700 or 83/703-704.[641] On his father’s side Ja’far was of course a Husaynid descendant of the Prophet, and like his father he had a doubly strong relationship to ‘Ali, since Muhammad al-Baqir was an ‘Alid on both his father’s and his mother’s sides.[642]