What titles did the Pope have in the Middle Ages? What did they mean? Which one is the oldest? When did it start?

The main title of Pope Pontifex maximus (chief builder of bridges) came from the first Roman priests. Another honorary title Servus Servorum Dei (servant of God’s servants) was adopted by the pope in the 7th century. The third, most proud title “Vicar of Christ” (temporarily acting Christ on Earth) was accepted by the popes after the break with the Byzantine Church.

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