الحسن بن علي بن أبي طالب
Muhammad al-Baqir () full name Muhammad bin 'Ali bin al-Husayn bin Ali bin Abi Talib, also known as "Abu Ja'far" or simply al-Baqir ("the one who opens knowledge") (677-733) was the fifth Imam in Shia Islam, succeeding his father Zayn al-Abidin and succeeded by his son Ja'far al-Sadiq. His mother, Fatima Umm Abdallah, was the daughter of Hasan ibn Ali, making him the first Imam descended from both grandsons of Muhammad: Hasan ibn Ali and Husayn ibn Ali.