Photos: Thousands gather for Pope Francis inaugural mass

Pope Francis waves to crowds as he arrives on his popemoble for his inauguration mass in St. Peter's Square at the Vatican on Tuesday, March 19, 2013. Pope Francis urged princes, presidents, sheiks and thousands of ordinary people gathered for his installation Mass on Tuesday to protect the environment, the weakest and the poorest, mapping out a clear focus of his priorities as leader of the world's 1.2 billion Catholics. (Oded Balilty/AP)