Explanation

The last Umayyad, Marwān II (reigned 744–750), was defeated at the Battle of the Great Zab River (750). Members of the Umayyad house were hunted down and killed, but one of the survivors, ʿAbd al-Raḥmān, escaped and established himself as a Muslim ruler in Spain (756), founding the dynasty of the Umayyads in Córdoba.