Al-Mutawakkil ʻAlā Allāh Jaʻfar ibn al-Muʻtasim عتصم) (March 822 – 11 December 861) is an Abbasid caliph who reigns in Samarra from 847 until 861.
He succeeds his brother al-Wāthiq and is known for putting an end to the Mihna "ordeal", the Inquisition-like attempt by his predecessors to impose a single Mu'tazili version of Islam.
