Pope Leo XVI, formerly Cardinal Robert Prevost, held the first Mass of his papacy in the Sistine Chapel on Friday morning, but that service was not open to the public.

Leo XIV celebrated his first Mass as pontiff at the Vatican's Sistine Chapel on May 9, the day after stunning the world as the first pope from the United States in the Church's history.

R obert Francis Prevost, now known as Pope Leo XIV, made history on Thursday, May 8, when he was elected as the first ...