Question: who built a european empire and was crowned emperor of the romans in 800
Answer: Charlemagne ( / ˈʃɑːrlɪmeɪn / ) or Charles the Great ( 2 April 742 -- 28 January 814 ) , numbered Charles I , was King of the Franks from 768 , King of the Lombards from 774 and Emperor of the Romans from 800 .