Tens of thousands of pilgrims watch the rare event
Pope Francis and his predecessor Pope Benedict have made a rare public appearance together to launch the Catholic Jubilee year.
The two popes embraced each other before opening a "Holy Door" in the walls of St Peter's basilica.
Pope Francis was launching his Holy Year of Mercy, declaring that mercy trumps moralising in his Catholic Church.
Tens of thousands of Catholic pilgrims assembled to watch the event.