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Alexius I, the Emperor of the Byzantine Empire, had been losing territory the Muslim Seljuk Turks. Some of this land was considered Holy Land to the Christian faith. Alexius I sent envoys to Pope Urban II asking for soldiers to help reclaim land.
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At the Council of Clermont in Southern France, Pope Urban II accepts the call of Alexius I for soldiers. The Pope calls on Christian soldiers to retake the Holy Land that is being held by Muslims.
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Armies from various parts of Western Europe arrive in Constantinople and most swear loyalty to Alexius I. They prepare to combat the Seljuks and Fatimids to obtain The Holy Land.
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The crusaders take Jerusalem from the Fatimids, ending the campaign to retake the Holy Land.