Pope Leo III was the head of the Catholic Church from 795 to 816, best known for crowning Charlemagne as Emperor of the Romans in 800. This event symbolized the fusion of Roman, Christian, and Germanic elements, marking a significant moment in medieval history that reinforced the idea of a Christendom united under a single ruler. Leo's actions not only solidified Charlemagne's authority but also established the precedent for the pope's role in legitimizing rulers.
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