Ja'far al-Sadiq

Ja'far al-Sadiq (c. 699-765) taught in Medina for some thirty-four years. Descended from Ali and from Abu Bakr, he held to study over revolt, and the Twelver school of law carries his name.

Muhammad ibn Ali (56 or 57–114 AH), called al-Baqir, was a son of Zayn al-Abidin and a grandson of both al-Hasan and al-Husayn. He taught hadith and law in Medina and is the fifth Imam of the Twelver Shi'a.