Pope Emeritus Benedict XVI (left) is welcomed by Pope Francis as he returns to the Vatican from the pontifical summer residence of Castel Gandolfo, southeast of Rome, on Thursday, May 2, 2013. (AP Photo/Osservatore Romano)

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Pope Emeritus Benedict XVI (left) is welcomed by Pope Francis as he returns to the Vatican from the pontifical summer residence of Castel Gandolfo, southeast of Rome, on Thursday, May 2, 2013. (AP Photo/Osservatore Romano)