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Mohammad was a prophet, ruler, judge, king and preacher in Medina. He conquered Mecca with 10,000 Muslim followers.
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Mohammad declared Mecca to be their holy place and that everyone must pray facing Mecca. All followers must pilgrim to the holy place once in their lifetime, the Hajj.
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Mohammad dies shortly after falling ill in 632 and Abu Bakr became the first caliph.
