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List of popes - Wikipedia
Pope - Wikipedia
Pope | Definition, Title, List of Popes, & Facts | Britannica
The Holy See - Vatican
Pope Francis - Wikipedia
Papacy | Definition, History, Roman Catholicism, List of Popes,
The Papacy in Rome - Rome after the fall of the Empire
Popes and antipopes | List, Difference, & Facts | Britannica
Popes of the Roman Catholic Church - Catholic Online
Popes of the Catholic Church | USCCB