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Muhammad. Al-Mansur's brother al-Saffah began asserting his claim to the caliphate in the 740s and became particularly active in Khorasan, an area where non-Arab Muslims lived. After the death of the Umayyad caliph Hisham ibn Abd al-Malik in 743, a period of instability followed. Al-Saffah led the Abbasid Revolution in 747, and his claim to power was supported throughout Iraq

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