Muḥammad al-Bāqir (Arabic: مُحَمَّد ٱلْبَاقِر), with the full name Muḥammad ibn ʿAlī ibn al-Ḥusayn ibn ʿAlī ibn Abī Ṭālib, also known as Abū Jaʿfar or simply al-Bāqir (lit. 'the one who opens knowledge') 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 Abd Allah, was the daughter of Hasan, making al-Baqir the first Imam who descended from both grandsons of Muhammad, namely, Hasan and Husayn.