How did Charlemagne relationship with the catholic church benefit both parties?

Roman Catholic AnswerCharlemagne was probably one of the most devout king and emporer that the world has ever had. He reunited Europe (save Spain), he saved Europe from the Muslims, to this day, scholars can not figure out he won that battle. Also, his government was a model of efficiency. He provided education for the clergy, reformed the monasteries and was finally crowned by Pope Leo as Emperor of the Roman Empire. For more information, get the book below by Diane Moczar: