Pope Francis leads a solemn celebration where two Popes, John Paul II and John XXIII will be canonized, in St. Peter's Square at the Vatican, Sunday, April 27, 2014. Tens of thousands of people have filled St. Peter's Square for a historic day of four popes, with Popes Francis and Benedict XVI honoring John XXIII and John Paul II by declaring them saints in the first ever canonization of two pontiffs. (AP Photo/Domenico Stinellis)