Vatican City, VATICAN CITY STATE: Pope Benedict XVI waves to the pilgrims before his weekly general audience on St-Peter's square at the Vatican, 15 June 2005. Pope Benedict XVI has asked Cardinal Josef Glemp to celebrate in Warsaw on Sunday the beatification of two Polish priests, the Vatican announced. AFP PHOTO/ Patrick HERTZOG (Photo credit should read PATRICK HERTZOG/AFP/Getty Images)
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Why this Pope's resignation shocked the world
Pope: The Most Powerful Man in History
When Pope Benedict XVI resigned the papacy in 2013, he became the first pontiff in nearly 600 years to step down. Watch a new episode of "Pope: The Most Powerful Man in History," Sunday at 10 p.m. ET/PT.
01:03 - Source: CNN
Pope: The Most Powerful Man in History 15 videos
Vatican City, VATICAN CITY STATE: Pope Benedict XVI waves to the pilgrims before his weekly general audience on St-Peter's square at the Vatican, 15 June 2005. Pope Benedict XVI has asked Cardinal Josef Glemp to celebrate in Warsaw on Sunday the beatification of two Polish priests, the Vatican announced. AFP PHOTO/ Patrick HERTZOG (Photo credit should read PATRICK HERTZOG/AFP/Getty Images)
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Why this Pope's resignation shocked the world
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The Vatican's World War II dilemma
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UNSPECIFIED - DECEMBER 16: Pope Alexander VI (1431-1504) and those who wielded power in the empire and the papacy, detail of The Madonna of the Recommended, 1500, by Cola da Orte and Giovanni Antonio da Roma, tempera on panel. Orte, Museo Diocesano D'Arte Sacra (Diocesan Art Museum) (Photo by DeAgostini/Getty Images)
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The Pope who founded modern diplomacy
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How church corruption funded iconic art
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"Pope Francis (Jorge Mario Bergoglio) meeting engaged couples for Saint Valentine feast on Saint Peter's Square. Vatican City, 2014 (Photo by Grzegorz Galazka\Archivio Grzegorz Galazka\Mondadori Portfolio via Getty Images)"
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A general view shows the crowd during the Easter Sunday mass on April 16, 2017 at St Peter's square in Vatican. Christians around the world are marking the Holy Week, commemorating the crucifixion of Jesus Christ, leading up to his resurrection on Easter. / AFP PHOTO / Filippo MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)
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The outlaw origins of the Catholic Church
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Pope Francis addresses diplomats during an audience for the traditional exchange of New Year greetings, in the Sala Regia hall at the Vatican on January 9, 2020.
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Can the pope ever be wrong?
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Charlene, Princess of Monaco (2-L) kisses the hand of Pope Francis, as her husband Prince Albert II of Monaco (L) looks on prior to a private audience with the pontiff at the Vatican on January 18, 2016. / AFP / FILIPPO MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)
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