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The Western Half of the Empire fell due to invasions, as well as other causes. It's significant because when the Empire fell, it allowed smaller kingdoms to become more powerful than under the Empire's control

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Charlemagne becomes king of the Franks. It's significant because he wanted to build a 'New Rome'.

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The vikings start attacking European settlements from Scandinavia. It's significant because they diffused their culture through adventuring to different land.

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Dec 25 800 CE: Charlemagne is Crowned Holy Roman Emperor

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Dec 25 800 CE: Charlemagne is Crowned Holy Roman Emperor