Al-Mu'tazz

Abū ʿAbd Allāh Muḥammad ibn Jaʿfar ibn Muḥammad ibn Hārūn al-Muʿtazz bi-ʾLlāh (; 847 – 16 July 869), better known by his regnal title al-Muʿtazz bi-ʾLlāh (, "He who is strengthened by God") was the Abbasid caliph from 866 to 869, during a period of extreme internal instability within the Abbasid Caliphate, known as the "Anarchy at Samarra".

Originally named as the second in line of three heirs of his father al-Mutawakkil, al-Mu'tazz was forced to renounce his rights after the accession of his brother al-Muntasir, and was thrown in prison as a dangerous rival during the reign of his cousin al-Musta'in. He was released and raised to the caliphate in January 866, during the civil war between al-Musta'in and the Turkish military of Samarra. Al-Mu'tazz was determined to reassert the authority of the caliph over the Turkish army but had only limited success. Aided by the vizier Ahmad ibn Isra'il, he managed to remove and kill the leading Turkish generals, Wasif al-Turki and Bugha al-Saghir, but the decline of the Tahirids in Baghdad deprived him of their role as a counterweight to the Turks. Faced with the assertive Turkish commander Salih ibn Wasif, and unable to find money to satisfy the demands of his troops, he was deposed and died of ill-treatment a few days later, on 16 July 869.