What title did Pope Leo III give Charlemagne at his coronation?

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At his coronation on December 25, 800 CE, Pope Leo III crowned Charlemagne as "emperor of the Romans". During the ceremony at St. Peter’s Basilica, the assembled Romans also acclaimed him as "Augustus and emperor".12

This act, which effectively restored the Roman Empire in the West, was a significant political development that established a new Western empire alongside the existing Eastern empire. While the title was intended to secure the papacy's position and promote Christian unity, it was considered an extralegal proceeding at the time and led to long-standing political rivalry with Constantinople.132