Abbasid Revolution
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Was the overthrow of the Umayyad Caliphate (661-750 CE), the second of the four major Caliphates in Islamic history, by the third, the Abbasid Caliphate (750-1517 CE).
Chronology
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October 749: Wasit is besieged by the Abbasid Caliphate.
February 748: Abu Muslim successfully initiated an open revolt against Umayyad rule. On February 14, 748 he established control of Merv.
January 750: The rebels where in control of Khorasan by march 749.
January 750: On January 16, 750 the two forces met on the left bank of a tributary of the Tigris in the Battle of the Zab, and nine days later Marwan II was defeated and his army was completely destroyed.
May 750: Damascus fell to the Abbasids in April.
August 750: Al-Fazari, the Umayyad commander at Wasit, held out even after the defeat of Marwan II in January. The Abbasids promised him amnesty in July, but immediately after he exited the fortress they executed him instead.
September 749: Yazid had been forced to abandon Kufa due to a rebellion by Abbasid sympathizers, and fled to Wasit.
January 746: In 746, Ibn Surayj began his revolt at Merv.
