Answer:
Charlemagne was a medieval ruler who ruled most of Western Europe from 768 to 814 AD.
Charlemagne, also known as Charles and Charles the Great, in 771 became king of the Franks, now a Germanic tribe, residing in Belgium, France, Luxembourg, the Netherlands, and West Germany.
Under his rule, he embarked on a mission to unite all Germans into one kingdom, and convert his people to Christianity, as noted in biographies of world figures quoted by History.