Pope Francis has appeared in St Peter’s Square in Rome for the inauguration Mass that marks the official start of his papacy.
Francis toured the square in an open-topped papal vehicle, descending to bless pilgrims behind the barriers.
Up to a million people, along with global political and religious leaders, are attending the Mass.
Francis was elected by a conclave of cardinals last week to take over from Benedict XVI.
Benedict became the first pontiff in 600 years to abdicate last month. Citing his age, 85, he said he could no longer continue in the post.
The first pontiff from the Americas, Francis has suggested he will take a more modest approach than predecessors.
Papal ring
Pope Francis left his temporary residence at Casa Santa Marta shortly before 09:00 (08:00 GMT) and began touring St Peter’s Square.
He waved to the hundreds of thousands of pilgrims, who flew flags and shouted: “Long live the Pope!”
Francis then entered St Peter’s Basilica and donned his vestments.