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A Western European armed expedition called by Pope Innocent III, originally intended to reconquer Muslim-controlled Jerusalem by means of an invasion through Egypt. Instead, a sequence of events culminated in the Crusaders sacking the city of Constantinople, the capital of the Christian-controlled Byzantine Empire.
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Roman popes and Byzantine emperors were longtime rivals the pope agreed. The pope ordered to free the Holy Land.
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General Belisarius was instrumental to Emperor Justinian's ambitious project of reconquering much of the Mediterranean territory of the former Western Roman Empire, which had been lost less than a century previously.
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