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 conducts a mass in Santa Anna church inside the Vatican, March 17, 2013.
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Pope Francis leaves the Paul VI hall with security at the Vatican, March 16, 2013.
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Pope Francis checks out of the church-run residence where he had been staying in Rome before becoming pontiff, March, 14, 2013. (Osservatore Romano)
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Key chains featuring images of the newly-elected Pope Francis are displayed in a tourist shop near the Vatican in Rome, March 15, 2013.