Sunday’s inauguration mass will begin with prayers at the tomb of St. Peter – the first pope – which is located directly under the main altar of St. Peter’s Basilica. Accompanied by the cardinals who elected him, Leo XIV will then process to St. Peter’s Square where the main service will be held.

On Sunday morning, May 18, a Mass for the beginning of the pontificate of Pope Leo XIV will take place in St. Peter's Square at the Vatican. Although the Mass is no longer described as an "enthronement,

The new pope will preside over an inauguration Mass on Sunday in St. Peter’s Square, according to the Vatican.