Why Was the First Crusade Successful?

How Prepared was the Muslim World for the Crusaders? Divisions in the Muslim world: Sunni and Shia Muslims hated each other more than they hated the Christians and would often ally with the crusaders against their rival group. Sunni Muslims controlled Asia Minor and Syria, under the leadership of the Caliph of Baghdad; while Shia Muslims controlled Egypt, under the Caliph of Cairo Power vacuum in Anatolia:

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