Pope Leo III crowns Charlemagne "Emperor of the Romans" on Christmas Day, December 25, 800 CE. The coronation took place during a mass at St. Peter's Basilica in Rome.
This event established Charlemagne as the first emperor of a unified Western Europe since the fall of the Western Roman Empire and solidified the strong relationship between the Frankish kingdom and the Papacy, creating a powerful link between secular and spiritual authority, The coronation took place after Charlemagne came to Rome to restore Pope Leo III's authority, who had faced a rebellion
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