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  Takes over after Muhammad's death as the first Caliph.
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  Under the rule of Abu Bakr
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  Under the regn of Abu Bakr
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  He is the second Caliph
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  Under the rule of Umar
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  He is murdered in a mosque by a Persian prisoner of war
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  He is the 3rd Caliph. He is married to one of Muhammad's daughters.
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  A group of Arab soldiers get together and murder Uthman
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  He is the 4th Caliph and he is married to Muhammad's daughter, Fatima.
