مروان بن محمد
The Third Fitna (), was a series of civil wars and uprisings against the Umayyad Caliphate beginning with the overthrow of Caliph al-Walid II in 744 and ending with the victory of Marwan II over the various rebels and rivals for the caliphate in 747. However, Umayyad authority under Marwan II was never fully restored, and the civil war flowed into the Abbasid Revolution (746–750) which culminated in the overthrow of the Umayyads and the establishment of the Abbasid Caliphate in 749/50. Thus a clear chronological delimitation of this conflict is not possible.