Pope Leo XIV’s installation Mass
Pope Leo XIV will formally begin his ministry as bishop of Rome with a liturgy steeped in tradition and rich in symbolism May 18.
The “Mass for the Inauguration of the Petrine Ministry,” to be held in St. Peter’s Square, will mark the visible and public start of his pontificate while grounding it in the Catholic Church’s apostolic continuity.
Although the pope’s canonical authority began the moment he accepted his election in the Sistine Chapel May 8, the installation Mass offers the universal church a moment of shared prayer and liturgical celebration to begin the pontificate.