Muḥammad b. ʿAlī known as Imām al-Bāqir (a) and Bāqir al-‘Ulūm, was the fifth Imam of the Shi’a, whose period of Imamate lasted nineteen years. Imam al-Baqir (a) made a great scientific movement which reached its peak at the time of his son Imam al-Sadiq (a).