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Constantine chose to have Constantinople as the Capitol of Byzantine. Constantine named the Capitol after himself.
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Byzantine General leading military figure in the time of the emperor Justinian. One of he last important figures in Roman military tradition, he led imperial armies against Persia, the Vandal, Italy, and Barbarian tribes.
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Justinian wanted to reconquer the Roman territory, big projects, building, and wars were taking place which lead to more and more taxes.
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Hague Sophia also called Church of Holy Wisdom built as a cathedral in Constantinople.
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Islamic prophet Muhammad established a new unified polity in the Arabian Peninsula and saw a century of rapid expansion.
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The military conquests of Bulgaria was held in a narrow Bulgarian mountain pass called Trajan's Gate.
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The Great Schism also called East-West Schism, it is the separation between Eastern Christian churches and Western churches.
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Pope Urban gives a speech of the Middle Ages, giving rise to the crusades by called all Christians in Europe to war against Muslims to reclaim holy land.
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The Fourth Crusade originally intended to conquer Muslim-controlled Jerusalem by invading Egypt. The Crusaders of Western Europe invaded the Christian city of Constantinople.
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Sultan Mehmed II ruler of the Ottoman Turks led the assault. Constantinople had about 10,000 man while the Turks had about 100,000-150,000. The siege lasted for about 50 days.