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“I, too, address the world's great powers by repeating the ever-present call ‘never again war,’� Leo said from the loggia of St. Peter’s Basilica to an estimated 100,000 people below.

It was the first time that Leo had returned to the loggia since he first appeared to the world on Thursday evening following his remarkable election as pope, the first from the United States. Then, too, he delivered a message of peace.

Leo was picking up the papal tradition of offering a Sunday blessing at noon, but with some twists. Whereas his predecessors delivered the greeting from the studio window of the Apostolic Palace, off to the side of the piazza, Leo went to the very center of the square and the heart of the church.

Part of that was logistics: He didn't have access to the papal apartments in the palace until later Sunday, when they were unsealed for the first time since Pope Francis' death.

Leo also offered a novelty by singing the Regina Caeli prayer, a Latin prayer said during the Easter season which recent popes would usually just recite and harked back to the old Latin Mass of the past.

Traditionalists and conservatives, many of whom felt alienated by Pope Francis' reforms and loose liturgical style, have been looking for gestures hinting at Leo's priorities. Some have expressed cautious optimism at the very least with a return to a traditional style that Leo exhibited on Thursday night, when he emerged for the first time wearing the formal red cape of the papacy that Francis had eschewed.

He followed up on Saturday by wearing the brocaded papal stole during a visit to a Marian sanctuary south of Rome. There, he knelt in reverence and greeted the crowd surrounded by priests in long cassocks usually favored by conservatives.

Aldo Maria Valli, a conservative Italian journalist who writes a popular blog, said he appreciated these gestures and urged traditionalists to give Leo a chance, saying he liked a lot of what he has seen so far. “Don't shoot Leo," he wrote.

On Sunday Leo wore the simple white cassock of the papacy and reverted back to wearing his silver pectoral cross. He had worn a more ornate one that contains the relics of St. Augustine and his mother, St. Monica, on Thursday night that had been given to him by his Augustinian religious order.

On hand in the square on Sunday for Leo's first noon prayer were two of Europe's more firebrand conservatives, France's Marine Le Pen and Italy's Matteo Salvini. The Italian minister has highlighted his Catholic faith in his political messaging.

Leo quoted Pope Francis in denouncing the number of conflicts ravaging the globe today, saying it was a “third world war in pieces.�

“I carry in my heart the sufferings of the beloved Ukrainian people," he said. “Let everything possible be done to achieve genuine, just and lasting peace as soon as possible.�

He called for the release of war prisoners and the return of Ukrainian children to their families, and welcomed the ceasefire between India and Pakistan.

He also called for an immediate ceasefire in Gaza, and for humanitarian relief to be provided to the “exhausted civilian population and all hostages be freed.�

Leo also noted that Sunday was Mother’s Day in many countries and wished all mothers, “including those in heaven� a Happy Mother’s Day.

The crowd, filled with marching bands in town for a special Jubilee weekend, erupted in cheers and music as the bells of St. Peter’s Basilica tolled.

Angela Gentile of Bari arrived in the square three hours early to be in place. Nonplussed that cardinals had elected yet another non-Italian pope, she said she was happy Leo came to the central balcony of the basilica, so the crowd could see him face-to-face. “What’s good for the Holy Spirit works for me,� she said. “I have trust.�

More than 50 pilgrims from Houston, Texas, were in the square, too, waving three large American flags. They were in Rome on a pre-planned Holy Year pilgrimage and said they were proud to be part of this historic occasion.

“Words cannot express my admiration and gratitude to God,� said the Rev. Dominic Nguyen, who led the Vietnamese American group. He said he hoped the pope would be happy to see the Stars and Stripes but also Peruvian flags and all other countries, showing the universality of the church.

Also Sunday, Leo celebrated a private Mass near the tomb of St. Peter and prayed at the tombs of several past popes in the grottoes underneath the basilica. Vatican Media filmed him praying before a mix of more progressive and tradition-minded popes: Pope Paul VI, who closed out the modernizing reforms of the 1960s Second Vatican Council, and Popes Pius XII and Benedict XVI, on the more conservative end of the spectrum.

He celebrated the Mass with the head of his Augustinian order and his brother, John, in the pews. In his homily, he recalled that Sunday was also the day that the Catholic Church celebrates religious vocations, and noted that the issue of declining vocations had been raised by cardinals in their pre-conclave discussions before his election.

Leo said priests can encourage more vocations by offering a good example, “living the joy of the Gospel, not discouraging others, but rather looking for ways to encourage young people to hear the voice of the Lord and to follow it and to serve in the church.�

Leo also attended the official unsealing of the papal apartments in the Apostolic Palace, which were sealed after Francis' April 21 death. It is unclear if Leo will move into the apartments or just use them for formal audiences as Francis did.

The 69-year-old Chicago-born missionary was elected 267th pope on Thursday. He has a busy week of audiences before his formal installation Mass next Sunday.