al-ʿAbbās b. Muḥammad b. ʿAlī - Encyclopaedia of Islam, THREE
[Article]
Bernheimer, Teresa
Leiden
Brill
(604 words)
Al-ʿAbbās b. Muḥammad b. ʿAlī (b. ʿAbdallāh b. al-ʿAbbās; d. 186/802) was the younger brother of the first two ʿAbbāsid caliphs, al-Saffāḥ (r. 132-6/749-54) and al-Manṣūr (r. 136-58/754-75). Al-ʿAbbās was a prominent figure in the early ʿAbbāsid period and played an important role in the establishment of ʿAbbāsid authority on the Byzantine frontier, helping to retake Malaṭya, a major frontier fort in eastern Anatolia, from the Byzantines in 139/756. He was appointed governor of al-Jazīra and