https://www.britannica.com/biography/Charlemagne
Charlemagne, also called Charles I, by name Charles the Great, (born April 2, 747?—died January 28, 814, Aachen, Austrasia [now in Germany]), king of the Franks (768–814), king of the Lombards (774–814), and first emperor (800–814) of the Romans and of what was later called the Holy Roman Empire.
