Answer: charlemagne

AnswerCrossword Clue
CHARLEMAGNEHe spent December 25, 800 being crowned Holy Roman Emperor
CHARLEMAGNEHoly Roman Empire founder
CHARLEMAGNEEighth-century king
CHARLEMAGNEKing who was the son of Pepin the Short
CHARLEMAGNESo-called "Father of Europe"