The Crowning of Charlemagne. In 800 Charlemagne marched to Rome to support Pope Leo III against the rebellious citizens. Whilst there he was crowned in St Peter's amidst the acclamations of the people; "Long life and victory to Charles Augustus; crowned of God; great and pacific Emperor of the Romans!" His imperial title; which marked the union of Church and State; was "Emperor of the Holy Roman Empire." Illustration for Hutchinson's History of the Nations (Hutchinson; c.1920). Note: Image has been digitally enhanced to facilitate repro.