What achievements did the empire of Charlemagne become famous for?

Charlemagne is not called the “Father of Europe” for nothing. During his reign, the state of the Franks expanded significantly. He became the founder of the New Roman Empire. Created an army with an effective mobilization system and a border fleet.
During the time of Charlemagne, the Vatican was created.
He introduced general education with the help of monastic schools, however, only for men. During his reign, the Academy of Arts and Sciences was created, and the mass circulation of handwritten books began.
By the way, the Russian word “king” came from the name of this great statesman.