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1.In 800, Pope Leo III crowned Charles Martel emperor of the Romans as a form of thanks for protection from the pope's enemies.
2.In 800, Pope Leo III crowned Clovis I emperor of the Romans as a form of thanks for protection from the pope's enemies.
3.In 800, Pope Leo III crowned Ferdinand emperor of the Romans as a form of thanks for protection from the pope's enemies.
4.In 800, Pope Leo III crowned Charlemagne emperor of the Romans as a form of thanks for protection from the pope's enemies.

4.In 800, Pope Leo III crowned Charlemagne emperor of the Romans as a form of thanks for protection from the pope's enemies.