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Pope urban II calls for the first crusade, the Christian army reclaims the holy land.
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The Second Crusade, led by European kings like Louis VII of France and Conrad III of Germany, ends in disappointment with failed attempts.
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Philip II of France, Richard I of England (The Lionheart) and Frederick I, Holy Roman Emperor lead the Third Crusade.
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Pope Innocent III declares the Fourth Crusade to take back Jerusalem.
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Started by a little French boy.
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Over the next five crusades the holy army was unsuccessful at reclaiming any territories.