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pope urban ll calls for the First Crusade at the council of Clermont, urging Christians to reclaim Jerusalem and aid the Byzantine Empire against Muslim forces.
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The first crusade takes place, resulting in the capture of Jerusalem by the Crusaders in 1099
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The second Crusade is launched in response to the fall of the Country of Edessa, but it ends in failure.
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The third Crusade, led by figures like Richard the Lionheart, aims to retake Jerusalem but results in a truce with Saladin.
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The forth Crusade deviates from its original goal and ends with the sack of Constantinople.