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Abu Bakr of the Umayyad clan becomes caliph, Umayyad Empire begins
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3rd Caliph, Uthman, is assassinated.
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those in support of the Umayyad empire win
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the Umayyad Empire is overthrown by the Abbasids. Abbasid Caliphate was established
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external and internal conflicts lead to the fall of the Abbasid Empire