Benedict Xvi

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Pope Benedict XVI is seen leaving St. Peter's Square on his pope-mobile after his last general audience, at the Vatican, Wednesday, Feb. 27, 2013. (AP Photo/Dmitry Lovetsky)

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Pope Benedict XVI greets well-wishers in St. Peter’s Square in Vatican City on Wednesday. Benedict on Thursday will become the first pope in six centuries to step aside. Some 150,000 people attended his farewell address. (Associated Press)

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Pope Benedict XVI kisses a baby during his general audience in St. Peter's Square at the Vatican, Wednesday, Feb. 27, 2013. Pope Benedict XVI basked in an emotional sendoff Wednesday at his final general audience in St. Peter's Square, recalling moments of "joy and light" during his papacy but also times of great difficulty. (AP Photo/Gregorio Borgia)

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** FILE ** Pope Benedict XVI leaves St. Peter's Basilica on a mobile platform at the end of a Mass at the Vatican on Sunday, Oct. 16, 2011. (AP Photo/Gregorio Borgia)

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In this undated photo, Pope Benedict XVI is seen wearing his iconic red shoes. (Credit: Associated Press)

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Archbishop Pier Luigi Celata reads a copy of a document signed by Pope Benedict XVI changing the rules of the conclave. (Associated Press)

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Archbishop Pier Luigi Celata reads a copy of a document signed by Pope Benedict XVI changing the rules of the conclave. (Associated Press)

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Pope Benedict XVI delivers his blessing during his last Angelus noon prayer from the window of his studio overlooking St. Peter's Square at the Vatican on Sunday, Feb. 24, 2013. (AP Photo/L'Osservatore Romano)

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Pope Benedict XVI greets the faithful at the end of the Ash Wednesday Mass in St. Peter's Basilica at the Vatican on Wednesday, Feb. 13, 2013. (AP Photo/Gregorio Borgia)