4 / 15

Crowds gather in St. Peter's Square for the inauguration Mass for Pope Francis at the Vatican, Tuesday, March 19, 2013. (AP Photo/Michael Sohn)

Crowds gather in St. Peter's Square for the inauguration Mass for Pope Francis at the Vatican, Tuesday, March 19, 2013. (AP Photo/Michael Sohn)

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.