The Abbasid army won a decisive victory over the forces of rebelling Armenian princes at the Battle of Bagrevand. Battle of Bagrevand: The Battle of Bagrevand was fought on 25 April 775, in the plains of Bagrevand, between the forces of the Armenian princes who had rebelled against the Abbasid Caliphate and the caliphal army. The battle resulted in a crushing Abbasid victory, with the death of the main Armenian leaders. The Mamikonian family's power in particular was almost extinguished. The battle signalled the beginning of large-scale Armenian migration into the Byzantine Empire. April 25, 775. Wiki link