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Daniela Petroff

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Pope Francis is driven through the crowd in St. Peter's Square at the Vatican, Sunday, April 27, 2014. Pope Francis has declared his two predecessors John XXIII and John Paul II saints in an unprecedented canonization ceremony made even more historic by the presence of retired Pope Benedict XVI. (AP Photo/Vadim Ghirda) (Vadim Ghirda)

A tale of four popes: Today Pope Francis canonized two predecessors in the presence of another

Nicole Winfield, Daniela Petroff