Eight of the worst popes in church history | CNN
All Popes of the Catholic Church: St Peter - Francis - YouTube
Popes of the Catholic Church | USCCB
End of the world: Why Pope's 2020 resignation 'will fulfil 900-year-old doomsday prophecy' | Weird | News | Express.co.uk
Every Pope ever: the full list | News | theguardian.com
Up to and including Francis, how many popes have there been altogether? | globalquiz.org
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Francis turns 85, becomes one of history's oldest popes - Los Angeles Times
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Benedict XVI | Biography, Resignation, Legacy, & Facts | Britannica
Holy Smoke, Antipopes And More: A Guide To Popes And The Papacy | HistoryExtra
Which popes received the title 'The Great'? What were the reasons that they were called so? - Quora
List of popes - Wikipedia
A look at popes and their encyclicals | Pew Research Center
Queen Elizabeth met five popes in her lifetime | Catholic News Agency
Dueling Popes? Maybe. Dueling Views in a Divided Church? Definitely. - The New York Times
Two popes are one too many
