Al-Mutawakkil

'''Ja'far ibn Muḥammad ibn Hārūn al-Mutawakkil ʿalā Allāh (); March 82211 December 861, commonly known by his regnal name al-Mutawwakil ala Allah''' (), was the tenth Abbasid caliph, ruling from 847 until his assassination in 861. He succeeded his brother, al-Wathiq (), and is known for expanding the empire to its maximum extent. He was deeply religious, and is remembered for discarding the Muʿtazila, ending the Mihna (a period of persecution of Islamic scholars), and releasing Ahmad ibn Hanbal. He is also known for his tough rule, especially with respect to non-Muslim subjects.

He was assassinated on 11 December 861 by the Turkic guard with the support of his son, al-Muntasir, marking the beginning of the period of civil strife known as the "Anarchy at Samarra".