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Pope Urban II makes a speech at the Council of Clermont, urging Christians to take up arms and reclaim the Holy Land.
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The second crusade was led by European kings, but their attempts were failed as they couldn't recapture lost territories.
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Phillip II of France, The Lionheart, Frederick I, Holy Roman Empire led the third crusade and acquired many territories but failed to get Jerusalem.
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Pope Innocent III declares a fourth crusade to get back Jerusalem.
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Tens of thousands of children marched into the Holy Land, none of them made it there, and they were most likely sold to slavery as they were never seen again.
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Throughout the next several years, there were 5 more Crusades, none of them were successful.