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The Emperor in Constantinople, called for help in his campaigns against growing Muslim strength. Pope Urban II in Rome called on Christians in Europe to join a crusade to liberate Jerusalem from the Muslims.
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Crusaders marched in towards the Holy Land, with many armies. In cities across Europe they slaughtered defenceless Jews in their way. The first armies arrived at Constantinople and crossed the Bosphorus to attack the Turks. One of those armies, One of Peter the Hermits was massacred. Multitudes died, many of starvation, in the two-year march to Jerusalem.
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Crusaders from Europe captured Jerusalem, slaughtering Muslims, Jews, and eastern Orthodox Christians alike.
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This failed because there was no communication between the two kings.
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The Third Crusade failed to capture Jerusalem due to lack of manpower.
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Latin Christians from Europe and army financed by Venetian merchants, conquered the eastern Orthodox centre of Constantinople, killing “fellow Christians” and taking the treasures of Byzantium to palaces in Europe. Although the armies of Rome withdrew some decades later, allowing the Orthodox Christians to re-settle Constantinople, the eastern half of the Christian Empire was so weakened that it easily fell to the Ottoman Turks in 1453.
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This Crusade to save the holy land was a failure although the Fifth Crusade was successful in capturing the city of Damietta, but could not hold it for long, especially after a crushing defeat at the Battle of Al-Mansura
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The Sixth Crusade ended with a peace treaty that gave Christians authority over several important Christian sites, including Jerusalem.
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Both of these were a failure. In the Seventh Crusade, Louis recaptured Damietta, but later had his army routed. In 1270 A.D., Louis died before he was able to reach the goal of the Eighth Crusade.
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It was an attempt to defeat the Mamluk sultan of Baibers. The crusade failed, and Edward returned home to England upon learning of the death of his father, Henry III.