In 800, Charlemagne was crowned "Roman Emperor". Thus, here correct option is D.
Charlemagne also known as Karl and Charles the Great, was a medieval emperor who ruled much of Western Europe from 768 to 814.
In 771, Charlemagne became king of the Franks, a Germanic tribe in-present day, Belgium, France, Luxembourg, the Netherlands and western Germany.
Charlemagne chose officials, called counts, to help assist him with the empire. With Charlemagne getting near the end of his life, the empire started to experience a downfall.
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