Abu Muslim initiated an open revolt against Umayyad rule, eventually leading to the establishment of the Abbasid Caliphate under the Black Standard. AD 747: Year 747 (DCCXLVII) was a common year starting on Sunday of the Julian calendar. The denomination 747 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. June 9, 747. Wiki link