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Pope - Wikipedia
List of popes - Wikipedia
The Bishop of Rome, servant of unity - Vatican News
Diocese of Rome - Wikipedia
Pope | Definition, Title, List of Popes, & Facts | Britannica
Papacy | Definition, History, Roman Catholicism, List of Popes,
The Holy See - Vatican
History of Europe - Bishops of Rome, Papal Power, Catholic Church
What’s the right role of the Bishop of Rome and papal primacy?
BBC - Religions - Christianity: The Pope