Pope Leo III crowned Charlemagne as Emperor of the Romans on December 25, 800 AD.
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He was crowned Emperor by the Pope in 800, but didn't use the title. Note that the notion that he was crowned Holy Roman Emperor is a later fiction.
he was a Germanic king, that was crowned emperor of Rome, by a pope
"King of the Romans" (upon election to the throne) "Emperor of the Romans" (upon being crowned by the pope) or "Holy Roman Emperor" (a modern term for the monarch of the Holy Roman Empire)
Charlemagne was crowned as King of the West Franks in 768, and this certainly made him a Germanic king. He was crowned Emperor of the Roman People by Pope Leo III in 800. Whether this actually made him he a Roman emperor is a question for debate. Certainly Empress Irene of what was called the Roman Empire at the time (now called the Byzantine Empire) did not think the title was legitimate. Please use the link to the related question below for more information on various countries calling themselves the Roman Empire.
He conquered and united most of Europe during the middle ages, and was crowned Holy Roman Emperor by the Pope.