Isa ibn Musa

ʿĪsā ibn Mūsā ibn Muḥammad ibn ʿAlī ibn ʿAbd Allāh ibn ʿal-ʿAbbās was a nephew of the first two Abbasid caliphs, al-Saffah and al-Mansur. He served as governor of Kufa in Iraq for fifteen years and led the suppression of the Alid revolt of 762–763. From 754 on he was also heir-apparent of the Caliphate, until he was pressured to cede precedence to al-Mansur's son al-Mahdi in 764. With al-Mahdi's accession in 775, he was forced to renounce his rights entirely in 776 in favour of al-Hadi, and retire to his palace at al-Ukhaidir Fortress, where he died in 784.