Al-Mutawakkil

Ja'far ibn Muḥammad ibn Hārūn al-Mutawakkil ʿalā Allāh ; March 822 – 11 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, and releasing Ahmad ibn Hanbal. He is also known for his tough rule, especially with respect to non-Muslim subjects.