The Mass comes less than a day after 133 cardinal electors selected Leo as the 267th pope of the Catholic Church.

POPE LEO THE 14TH. AND MANY CAME HERE TODAY TO CHRIST THE KING CATHOLIC CHURCH TO PRAY FOR THEIR NEW PONTIFF FOR THE VERY FIRST TIME DURING MASS TODAY, FOR THE FIRST TIME IN OVER TWO WEEKS ...

Leo's formal inauguration mass to mark his appointment will take ... and is often credited with laying the foundation for modern Catholic social teaching. Prevost became a cardinal only in 2023.