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Pope Urban II delivers the speech at the Council of Clermont, calling for the First Crusade. This speech urged Christians to take up arms and reclaim the Holy Land from Muslim control.
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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 to recapture territories lost to the Muslims.
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Philip II of France, Richard I of England (The Lionheart) and Frederick I, Holy Roman Emperor lead the Third Crusade. They took back many territories from Saladin but failed to win back Jerusalem.
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Pope Innocent III declares the Fourth Crusade to take back Jerusalem.