"Early Middle Ages"

According to Arab sources in the year 750, Al-Saffah, the founder of the Abbasid Caliphate, launched a massive rebellion against the Umayyad Caliphate from the province of Khurasan near Talas.After eliminating the entire Umayyad family and achieving victory at the Battle of the Zab, Al-Saffah and his forces marched into Damascus and founded a new dynasty.