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Pope Urban II calls for the First crusade at the Council of Clermont speech.
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Led by European kings like Louis VII of France and Conrad III of Germany, ends in disappointment..
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Philip II of France, Richard I of England (The Lionheart) and Frederick I, Holy Roman Emperor lead.
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Pope Innocent III declares the Fourth Crusade to take back Jerusalem.
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Tens of thousands of children gathered to march to the Holy Land.
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None of them would be very successful in terms of gaining control of the Holy Land.