The Battle of the Blacks or Battle of the Slaves was a conflict in Cairo that occurred during the Rise of Saladin in Egypt, on 21–23 August 1169, between the black African units of the Fatimid army and other pro-Fatimid elements, and Sunni Syrian troops loyal to the Fatimid vizier, Saladin. Saladin's rise to the vizierate, and his sidelining of the Fatimid caliph, al-Adid, antagonized the traditional Fatimid elites, including the army regiments, as Saladin relied chiefly on the Kurdish and Turkish cavalry that had come with him from Syria. According to the medieval sources, which are biased towards Saladin, this conflict led to an attempt by the palace majordomo, Mu'tamin al-Khilafa, to enter into an agreement with the Crusaders and jointly attack Saladin's forces to get rid of him. Saladin learned of this conspiracy and had Mu'tamin executed on 20 August. Modern historians have questioned the veracity of this report, suspecting that it may have been invented to justify Saladin's subsequent move against the Fatimid troops.