Timeline
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632 - 634Abu Bakr becomes the first caliph (successor to Muhammad) of the Rashidun Caliphate.
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634 - 644Umar ibn al-Khattab succeeds Abu Bakr, becoming the second caliph of the Rashidun Caliphate.
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644 - 656Uthman ibn 'Affan succeeds Umar to become the third caliph of the Rashidun Caliphate.
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656 - 661Ali ibn Abi Talib succeeds Uthman to become the fourth and final caliph of the Rashidun Caliphate.
