What Leader Of The Franks Was Crowned Holy Roman Emperor In The Year 800 Ad And Is Also Considered The Father Of The French And German Monarchies?. He was crowned emperor in 800. Crowned king of the franks in 768, charlemagne expanded the frankish kingdom, eventually establishing the carolingian empire.

As a token of thanks, leo crowned charlemagne on christmas day that year, declaring him emperor of the romans. Charlemagne went to his aid in rome and defeated the rebellion. Charlemagne (charles the great, also known as charles i, l.