Pope Leo XIV greeting the faithful at St. Peter's Square on Wednesday.

Pope Leo XIV on Sunday in the Apostolic Palace overlooking St. Peter’s Square at the Vatican.

Pope Leo XIV leaving Gemelli Hospital in Rome on Saturday.

Pope Leo XIV at a torchlight procession last month in Lourdes, France. Vatican experts wondered if he already knew of his cancer diagnosis during that visit.

Mass in St. Peter’s Square at the Vatican on Wednesday. The service was held by Cardinal Luis Antonio Tagle in Pope Leo’s absence, and included special prayers for the pontiff’s health.

A statue of Pope John Paul II outside the hospital in Rome where Pope Leo XIV was hospitalized. The statue has become a gathering point for prayers.

Pope Leo arriving at a hospital in Rome ahead of his surgery on Tuesday. The cancer diagnosis changes the outlook for a pope whose relative youth suggested he might have decades to reign.

Pope Leo XIV was welcomed by Daniele Franco, the president of Gemelli University Hospital in Rome, before an operation to remove a mass from his lung on Tuesday.

Pope Leo XIV arriving at the Policlinico A. Gemelli hospital in Rome on Tuesday.

Pope Leo XIV mentioned the planned surgery while speaking in St. Peter’s Square at the Vatican on Sunday.

In Metz, in northeastern France, Pope Leo XIV spoke of a Europe that would “continue to flourish and to inspire the whole world.” President Emmanuel Macron of France looked on.

Pope Leo XIV is welcomed by France’s President Emmanuel Macron upon his arrival at Orly airport on the outskirts of Paris on Friday.

Pope Leo XIV at a meeting southwest of Rome on Wednesday.

Pope Leo XIV has been a steady critic of the U.S.-Israeli war in Iran.

Brian Burch, the U.S. ambassador to the Holy See.

A procession on Wednesday by the traditionalist Society of St. Pius X in Écône, Switzerland.

The bishops newly consecrated by the Society of St. Pius X, in defiance of the Vatican, in Écône, Switzerland, on Wednesday.

Pope Leo XIV arrives at Plaza de Lima in Madrid on Saturday, June 6, for a prayer vigil with young people on the first day of a seven-day visit to mainland Spain and the Canary Islands.

Pope Leo XIV’s image was projected on the Sagrada Familia as he blessed the church in Barcelona on Wednesday.

Bad Bunny performing at the Super Bowl in Santa Clara, Calif., in February; Pope Leo in Madrid on Tuesday.

Armando Jesús Lovera in Valladolid, Spain, at the local headquarters of the Augustinian order.

Pope Leo XIV welcoming Prime Minister Pedro Sánchez of Spain at the Vatican last month, in a photo made available by Vatican media.

Pope Leo XIV at the Royal Palace in Madrid on Saturday, as he begins a visit to Spain.

Pope Leo XIV shook the hand of Christopher Olah, a co-founder of the A.I. company Anthropic, at the presentation of the encyclical titled “Magnifica Humanitas,” or “Magnificent Humanity,” on Monday at the Vatican.

Pope Leo XIV at the presentation of his encyclical titled “Magnifica Humanitas,” or “Magnificent Humanity,” on Monday at the Vatican.

Pope Leo XIV speaks during the presentation of “Magnifica Humanitas,” his first encyclical, at the Vatican on Monday.

Pope Leo has made artificial intelligence a central theme of his first year as pontiff.

Pope Leo XIV at the presentation of his first encyclical letter, “Magnifica Humanitas,” at the Vatican on Monday. In it, he outlined his desire to protect human dignity and agency in an age of artificial intelligence.

Pope Leo XIV arriving at St. Peter’s Square in the Vatican on Wednesday.

Secretary of State Marco Rubio at the U.S. Embassy to the Holy See in Rome last year.

A photo released by the Vatican on Monday showed Pope Leo meeting with the Most Rev. Sarah Mullally, the archbishop of Canterbury, at the Vatican.