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Muhammad and his followers move to Medina to escape persecution in Mecca whis is known as the "Hijrah" and marks the beginning of the Islamic calendar.
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Muhammad returns to Mecca and gains control of the city. Mecca becomes the center of the Islamic world.
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Muhammad dies and Abu Bakr succeeds Muhammad as leader of the Islam faith. He is the first of the four "Rightly Guided" Caliphs. This also marks the beginning of the Rashidun Caliphate.
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Umar becomes the second Caliph. The Islamic Empire expands during his rule to include much of the Middle East including Iraq, Egypt, Syria, and part of North Africa.