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Fatimid Caliph Al-Hakim issues orders to burn the Church of the Holy Sepulchre. The Church of the Holy Sepulchre is revered as the site of Christ's crucifixion, a place known as Calvary or Golgatha, and the tomb where he was buried and resurrected.
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The Great Schism happens by the Patriarch of Constantinople and the Pope excommunicate each other
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The First Crusade is set in motion by Pope Urban II
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Crusaders capture Jerusalem and kill everyone in the city
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The Knights Templar formed to protect pilgrims, from western Europe, who came to visit Jerusalem, after it fell during the first crusade, while they traveled through Muslim-controlled territory.
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The Second Crusade begins to recapture various lost land from the Muslims. The Crusaders are defeated.
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The sultan of Egypt, Saladin, captures Jerusalem again. He releases the population for ransom or enslaves them.
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The leaders of three Western Christianity states, King Richard of England, King Philip II of France, and King Frederick I of the Holy Roman Empire set out to reconquer the Holy Land after Jerusalem fell to Sultan Saladin.
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The Crusaders sack Constantinople during the Fourth Crusade
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The Albigensian Crusade was a 20-year military campaign founded by Pope Innocent III to eliminate Catharism in southern France.
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The Children's Crusade was a failed crusade to regain the Holy Land from the Muslims. It is said that "a boy begins to preach in either France or Germany, claims that he had been visited by Jesus, who instructed him to lead a Crusade in order to peacefully convert Muslims to Christianity. " He eventually amasses a following of 30,000 children. These children end up being sold to merchants.
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