Premise: Charlemagne ( [ ˈʃɑːrlᵻmeɪn ] ) or Charles the Great ( 2 April 742/747/74828 January 814 ) , numbered Charles I , was the King of the Franks from 768 , King of the Lombards from 774 and Emperor of the Romans from 800 . Charlemagne reached the height of his power in 800 when he was crowned Emperor of the Romans by Pope Leo III on Christmas Day at Old St. Peter 's Basilica .
Hypothesis: Charlemagne was named Emperor of the Romans in Vatican City.
Label: NEUTRAL