al-Khurasani ( Persian : ابو مسلم خراسانى, Arabic : أبو مسلم عبد الرحمن بن مسلم الخراساني‎, c. 700 - 755) was an Abbasid general of Persian origin, who led the first major and organized liberal movement against the Umayyad dynasty . His original name was Behzadan, prior to his father Vandad