Pope Francis began his first full day as leader of the world's 1.2 billion Roman Catholics Thursday with prayers and a celebration of Mass with the cardinals who elected him.
Pope Francis's First Days as the Pope
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Pope Francis with Argentine President Cristina Fernandez, holding a picture of a plaque commemorating the 1984 peace and friendship treaty between Argentina and Chile, March 18, 2013.
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Pope Francis and Uruguay's priest Gonzalo Aemilius greet people at the Vatican, March 17, 2013.
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Pope Francis greets the crowds after conducting a mass in Saint Anna church inside the Vatican, March 17, 2013.
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Pope Francis appears at the window of his future private apartment to bless the faithful, gathered below in St. Peter's Square, during the Sunday Angelus prayer at the Vatican March 17, 2013.