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The Roman legions were needed to help defend the Roman Heartland.
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Clovis and a few thousand of his elite soldiers converted to Latin Christianity
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From 500 CE to 800 CE the economies relied significantly on the subsistence of agriculture and bartering.
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The market exchange was growing as a component of the European economy.
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The English kingdom, known as Wesses, was able to put a stop to and defeat the invading Vikings.
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Otto I, was crowned as emperor by the Pope, cementing the idea of a Holy Roman Empire
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Viking descended king, William the Conqueror, invaded and defeated the Anglo-Saxon king and instituted Norman rule.
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Pope Urban II gave a sermon in France that was intended to summon the knights of Europe to protect Christians near the Holy Land.
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The Crusaders captured Jerusalem and a lot of the Levant which formed a series of Christian territories in the heart of the Holy Land
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Europes population went from 14 million in 600 CE, to 74 million in 1300, that is a 500% increase in 700 years.
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The Pope gained a lot of power from taking control over militaries, the education of their people, and the government. Kings were powerful enough to control the Pope and the churches in their civilizations. The spread of Christianity gave the Pope a lot more power over the people and very influential at all levels.