Khurasan with the Abbasids gaining increasing ascendency. Finally, Nasr fell sick and died at Rayy on 9 November 748 at the age of eighty-five.

Marwan campaigned in Egypt in 749 to quell the Bashmuric Revolt and secure his rear, but his campaign was a failure. The Abbasids, meanwhile, achieved success in the Hijaz. Marwan suffered a decisive defeat by Abu al-Abbas al-Saffah on the banks of the Great Zab,