Muḥammad 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 (Arabic: محمد الباقر‎, romanized: al-Bāqir, lit. 'the one who opens knowledge') (677-733) was the fifth Shia Imam, succeeding his father Zayn al-Abidin and succeeded by his son Ja'far al-Sadiq.