Charlemagne was crowned emperor.
Carolingian Empire . In 800 , the Frankish king Charlemagne was crowned emperor in Rome by Pope Leo III in an effort to revive the Roman Empire in the west during a vacancy in the throne of the eastern Roman Empire . Charlemagne . He was the first recognised emperor in western Europe since the fall of the Western Roman Empire three centuries earlier . Charlemagne died in 814 , having ruled as emperor for thirteen years .