Al-Muwaffaq

Abu Ahmad Ṭalḥa ibn Jaʿfar ibn Muḥammad ibn Hārūn al-Muwaffaq bi'Llah, better known by his laqab as Al-Muwaffaq Billah, was an Abbasid prince and military leader, who acted as the de facto regent of the Abbasid Caliphate for most of the reign of his brother, Caliph al-Mu'tamid. His stabilization of the internal political scene after the decade-long "Anarchy at Samarra", his successful defence of Iraq against the Saffarids and the suppression of the Zanj Rebellion restored a measure of the Caliphate's former power and began a period of recovery, which culminated in the reign of al-Muwaffaq's own son, the Caliph al-Mu'tadid.