Abū al-Ḥasan ʿAlī ibn ʿAbd Allāh ibn Khālid ibn Yazīd ibn Muʿāwiya ibn Abī Sufyān, better known as Abū al-ʿUmayṭir al-Sufyānī, was an Umayyad rebel against Abbasid rule in Syria during the Fourth Muslim Civil War and a self-proclaimed messiah who, in 811, attempted to restore the Umayyad Caliphate, which had been toppled by the Abbasids in 750. He expelled the Abbasid governor of Syria, Sulayman ibn Abi Ja'far, from Damascus and set up a quasi-administration in the city. His claim to the caliphate soon after gained recognition in different parts of the Damascus, Homs and Qinnasrin districts, including the port of Sidon and city of Homs.