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Faithful gather in St. Peter's Square at the Vatican, Tuesday, March 19, 2013. Pope Francis has urged princes, presidents, sheikhs and thousands of ordinary people gathered for his installation Mass to protect God's creation, the weakest and the poorest of the world. (AP Photo/Dmitry Lovetsky)

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Pope Francis celebrates first mass

March 19, 2013

Pope Francis celebrated his inaugural mass on March 19 in St. Peter's Square at the Vatican, among political and religious leaders from around the world.