Abbasid Revolution: Abu Muslim Khorasani begins an open revolt against Umayyad rule, which is carried out under the sign of the Black Standard.

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.

The Abbasid revolution, was the overthrow of the Umayyad Caliphate (661–750), the second of the four major caliphates in Islamic history, by the third, the Abbasid Caliphate (750–1517).

Abu Muslim Abd al-Rahman ibn Muslim al-Khurasani was a Persian general who led the Abbasid Revolution that toppled the Umayyad dynasty, leading to the establishment of the Abbasid Caliphate.

The Umayyad Caliphate or Umayyad Empire was the second caliphate established after the death of the Islamic prophet Muhammad and was ruled by the Umayyad dynasty. Uthman ibn Affan, the third of the Rashidun caliphs, was also a member of the clan. The family established dynastic, hereditary rule with Mu'awiya I, the long-time governor of Greater Syria, who became caliph after the end of the First Fitna in 661. After Mu'awiya's death in 680, conflicts over the succession resulted in the Second Fitna, and power eventually fell to Marwan I, from another branch of the clan. Syria remained the Umayyads' main power base thereafter, with Damascus as their capital.

The Black Banner or Black Standard, also known as the Banner of the eagle or simply as The Banner is one of the Islamic flags flown by the Islamic prophet Muhammad according to Muslim tradition. It was historically used by Abu Muslim in his uprising leading to the Abbasid Revolution in 747 and is therefore associated with the Abbasid Caliphate in particular. It is also a symbol in Islamic eschatology, though this tradition is weak according to hadithic standards.