Archbishop George Gaenswein, prefect of the papal household, right, welcomes Italian President Giorgio Napolitano and his wife Clio as they arrive 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/Gregorio Borgia)