Pope Leo XIV celebrates Mass at the Volkswagen Arena in Istanbul, Turkey, on Nov. 29, 2025. / Credit: Vatican Media/Screenshot

Istanbul, Turkey, Nov 29, 2025 / 11:20 am (CNA).

Pope Leo XIV marked the start of Advent on Saturday with an appeal for unity and peace, telling thousands gathered for Mass in Istanbul that Christians “journey as if on a bridge that connects earth to heaven,” keeping their eyes “fixed on both shores” until they are united “in the house of the Father.”

The pope celebrated Mass on Nov. 29 at the Volkswagen Arena, a large multipurpose venue within Istanbul’s Uniq cultural complex. The liturgy, held on the eve of the feast of St. Andrew, patron of Turkey, took place during the third day of his first international apostolic trip, which has brought him to Turkey and will soon continue on to Lebanon.

In his homily, the pope reflected on the beginning of Advent, saying it prepares believers “to experience anew at Christmas the mystery of Jesus, the Son of God, begotten, not made, consubstantial with the Father.” Drawing on the first reading from Isaiah (Is 2:1–5), he invited the faithful “to ascend the mountain of the Lord,” which he described as an image of divine light and peace.

Leo pointed to two key images in the reading. The first was the mountain “established as the highest of the mountains,” which he said reminds Christians that God’s gifts “are a gift not only for us, but for everyone.” He cited examples of evangelizing witness: St. Peter meeting Christ through St. Andrew’s enthusiasm, and St. Augustine coming to the faith through St. Ambrose. Recalling a line from St. John Chrysostom — “The miracle happens and passes, but the Christian life remains and continually edifies” — he urged the faithful to “keep watch” with prayer, charity, and spiritual vigilance.

The second image was the prophet’s vision of peace: “They shall beat their swords into plowshares… neither shall they learn war any more.” The pope said the message is especially urgent today, calling the Church to be a sign of reconciliation in a world marked by conflict.

Turning to the theme of bridges, Leo noted that the logo for his visit to Turkey features the Bosporus Bridge, which joins Asia and Europe. He said the image points to three essential “bridges of unity”: within the Catholic community, in relations with other Christians, and in dialogue with other religions.

The pope highlighted the four Catholic traditions present in Turkey — Latin, Armenian, Chaldean, and Syriac — calling them “a catholicity that unites.” Unity, he said, “needs care, attention, and maintenance.” Quoting Christ’s prayer “that they may all be one,” he appealed again for Christian unity and encouraged believers to be peacemakers.

The diversity of Turkey’s Catholic community was visible in the liturgy. A choir of about 200 members represented the country’s four rites. Scripture readings and prayer intentions were offered in Turkish, Aramaic, Syriac, English, Armenian, and Arabic, reflecting the multilingual and multicultural character of local Catholics.

On Sunday afternoon, the pope will depart Turkey for the second leg of his apostolic journey in Lebanon. Before leaving Istanbul, he is scheduled to participate in several ecumenical events in the morning.

Pope Leo XIV and Ecumenical Patriarch Bartholomew I of Constantinople sign a joint declaration at the Palace of the Ecumenical Orthodox Patriarchate in Istanbul, Turkey, on Nov. 29, 2025. / Credit: Vatican Media

Istanbul, Turkey, Nov 29, 2025 / 10:07 am (CNA).

Pope Leo XIV and Ecumenical Patriarch Bartholomew I of Constantinople said on Saturday they are “deeply alarmed by the current international situation,” issuing a joint appeal for peace.

The appeal took place during the pope’s first international trip, a journey that has taken him to Turkey and will continue on to Lebanon.

The two leaders signed a joint declaration at the Palace of the Ecumenical Orthodox Patriarchate in Istanbul. The text rejects the use of religion to justify violence, urges global efforts toward peace, supports cooperation among believers of different faiths, and entrusts a suffering world to God with renewed hope in the Holy Spirit.

The pope and the patriarch, who is considered first among equals among Eastern Orthodox bishops, reaffirmed their shared commitment to dialogue aimed at restoring full communion between the Catholic Church and the Orthodox churches. Calling Christian unity a gift from God, they encouraged clergy and faithful to pray and work for the fulfillment of Christ’s prayer “that they may all be one.”

Marking the 1,700th anniversary of the First Council of Nicaea, they pointed to the Nicene Creed as a shared foundation of faith and expressed hope for a future common celebration of Easter. They recalled with gratitude the 60th anniversary of the lifting of mutual excommunications in 1965 by St. Paul VI and Ecumenical Patriarch Athenagoras I, and called for renewed courage in pursuing dialogue.

Acknowledging the obstacles that still hinder full communion, Leo and Bartholomew said they remain committed to addressing them through theological exchange and fraternal encounter.

In their declaration, they appealed to civil and political leaders to “do everything possible to ensure that the tragedy of war ceases immediately” and asked all people of goodwill to join them in this plea. They encouraged efforts to build a just and supportive society and to care for creation, insisting that only such shared responsibility can overcome indifference, domination, greed, and xenophobia.

Earlier in the day, Pope Leo joined Patriarch Bartholomew for a doxology, a liturgical prayer of praise to God, at St. George’s Ecumenical Orthodox Patriarchal Church in Istanbul. The pope said he felt “great emotion” upon entering the historic church, noting that he was mindful of the gestures of his predecessors and grateful for the friendship he has shared with Bartholomew since the beginning of his ministry as bishop of Rome.

The Ecumenical Patriarchate, based in Istanbul, is recognized as the central coordinating seat of the Orthodox Church. Patriarch Bartholomew I, widely known for his leadership in ecumenical dialogue and environmental advocacy, is considered the 270th successor of St. Andrew.

On Saturday morning, the pope also met privately with leaders of Christian churches in Turkey at the Syriac Orthodox Church of Mor Ephrem in Istanbul, where he was welcomed by the Syriac Orthodox Patriarch Ignatius Aphrem II. Concluding the meeting, he reflected on the significance of the Council of Nicaea and the Gospel of the Incarnation, calling the assembled leaders to prayer, unity, and renewed evangelization. He invited them to journey together toward the 2033 Jubilee with the hope of advancing toward full communion, inspired by the motto “In Illo Uno Unum” (“Unity in the One”).

Mor Ephrem, located in Yeşilköy, is the first church to be built in Turkey since the founding of the Republic. Construction began nearly a decade before its inauguration in 2023 but was slowed by administrative delays, the COVID-19 pandemic, and the 2023 earthquake.

During the gathering, a choir sang an invocation to the Holy Spirit before the leaders sat together at a round table for a closed-door exchange. Each offered brief remarks, followed by the pope’s address. The patriarchal vicar led the Lord’s Prayer before the pope’s departure.

The Syriac Orthodox Church, headquartered in Damascus, Syria, numbers around 2 million faithful worldwide, and its patriarch plays an important role in ecumenical relations.

ISTANBUL (CNS) -- Pope Leo XIV, like his two immediate predecessors, visited the so-called Blue Mosque in Turkey's capital; he spent about 20 minutes inside but did not appear to pause for prayer as Pope Benedict XVI and Pope Francis had done.

Instead, he listened to Askin Musa Tunca, the mosque's muezzin who calls people to prayer five times a day, explain the building, its construction and how Muslims pray. And the pope asked questions. 

Tunca told reporters afterward that the mosque is "the house of Allah -- it's not my house; it's not your house," and so he told Pope Leo he could pray if he wanted. "'That's OK,' he said, he wanted to see the mosque."

Reporters pressed Tunca, asking again if the pope prayed. "Maybe to himself, I don't know," he responded.

The Vatican press office said afterward that Pope Leo visited the mosque "in a spirit of reflection and attentive listening, with deep respect for the place and for the faith of those who gather there in prayer."

As is customary, Pope Leo removed his shoes in the courtyard before entering the mosque in white socks. 

Formally called the Sultan Ahmed Mosque, the Muslim house of prayer was complete in 1617 and is known as the Blue Mosque because of the more than 21,000 blue tiles that decorate its walls, arches and domes. The tiles come from Iznik, site of the ancient Nicaea, which Pope Leo had visited the day before.

Leaving the mosque, Pope Leo noted to Tunca that they were going through a doorway with a sign that said, "No exit." The muezzin replied that the sign was for tourists but, if the pope preferred, "you do not have to go out. You can stay here."

Pope Benedict XVI had visited the Blue Mosque in 2006, and Pope Francis toured it in 2015. Both had paused for a moment of silence facing the mihrab, which indicates the direction of the Islamic holy city of Mecca. St. John Paul II was the first pontiff to visit a mosque when he went to the Umayyad mosque in Damascus, Syria, in 2001. 

In late October Pope Leo had led Vatican celebrations of the 60th anniversary of Nostra Aetate, the Second Vatican Council's document on relations with other world religions. The bishops at Vatican II said Catholics have esteem for their Muslim brothers and sisters, who "adore the one God, living and subsisting in himself; merciful and all-powerful, the Creator of heaven and earth," and "they take pains to submit wholeheartedly to even his inscrutable decrees."
 

Pope Leo XIV visits the Sultan Ahmed Mosque in Istanbul, Turkey, on Nov. 29, 2025. / Credit: Vatican Media

Istanbul, Turkey, Nov 29, 2025 / 03:10 am (CNA).

Pope Leo XIV started his third day in Turkey on Saturday with a visit to the Sultan Ahmed Mosque in Istanbul. The visit was a gesture of respect toward the Islamic world, fraternity with Muslims, and continuity in building bridges of interreligious dialogue, though the pope declined an invitation to pray in the Muslim house of worship.

The so-called “Blue Mosque” stands as one of the most important Islamic buildings in Istanbul. Its beauty, its scale, and its history continue to attract visitors from all over the world. It also holds a unique place in the relationship between Christianity and Islam, as several popes have passed through its doors in silence and respect.

Benedict XVI visited the mosque in 2006 during his visit to the country. The visit came less than three months after an address he made in Regensburg, Germany, in which he quoted a medieval emperor’s description of Islam as “evil and inhuman” and “spread by the sword,” provoking a fierce reaction in the Muslim world. The Vatican’s spokesman at that time, Father Federico Lombardi, said that Benedict paused for meditation inside the mosque. Pope Francis entered the mosque in 2014 and stood in what the Vatican described as a “moment of silent adoration” of God inside the Muslim place of worship.

After Leo’s visit on Saturday, the Holy See Press Office said in a statement that “the pope experienced the visit to the mosque in silence, in a spirit of reflection and attentive listening, with deep respect for the place and for the faith of those who gather there in prayer.”

One of the pope’s hosts for the visit, muezzin Aşgın Musa Tunca, told reporters afterward that he had told the pope he was welcome “to worship here” but that Leo had replied: “No, I am just going to look around.”

A notable omission from Leo’s itinerary, and a point of tension in Catholic-Islamic relations, is Hagia Sophia, the Byzantine church-turned-mosque that the Turkish government designated a museum open to all faiths in the 20th century. Popes Paul VI, John Paul II, Benedict XVI, and Francis all visited the monument on previous papal visits to Turkey. Francis said he was “deeply pained” when the government turned it back into a mosque in 2020.

Asked on Thursday why Leo would not be visiting Hagia Sophia, Bruni said: “It simply was not put on the program.”

The “Blue Mosque,” which Leo visited on Saturday, was built between 1609 and 1617 by Sultan Ahmed I. It occupies part of the site where the Grand Palace of Constantinople once stood. The goal was to make it the most important place of worship in the Ottoman Empire.

The construction process was carefully organized. The name “Blue Mosque” comes from approximately 21,000 turquoise ceramic tiles placed along the walls and the main dome. Walls, arches, and columns carry the famous Iznik tiles in tones from blue to green. Light entering through 260 small windows also gives the prayer hall a remarkable atmosphere.

The Sultan Ahmed Mosque is the only mosque with six minarets. Most mosques have four. Only one of the Ka’ba in Mecca, Saudi Arabia, exceeds it, with seven.

Correction: An earlier version of this story referred to Father Federico Lombardi as Father Pietro Lombardi. The story has been updated with the correct name. (Published Nov. 29, 2025)

The Council of Nicaea in 325 as depicted in a fresco in Salone Sistino at the Vatican. / Credit: Giovanni Guerra (1544-1618), Cesare Nebbia (1534-1614) e aiuti, Public domain, via Wikimedia Commons

Washington, D.C. Newsroom, Nov 28, 2025 / 10:00 am (CNA).

In the summer of A.D. 325, more than 300 bishops gathered in Nicaea — located in modern-day northern Turkey — to promulgate a common Christian creed, settle Christological disputes that arose from the Arian heresy, and promote unity in the Church.

The first ecumenical council, known as the Council of Nicaea, is still accepted as authoritative by the Catholic Church, the Eastern Orthodox Church, and many Protestant denominations. The common beliefs still offer a strong element of unity in an otherwise fractured Christianity 1,700 years later.

During the council, the bishops established the initial formulation of the Nicene Creed, which is the profession of faith still recited at the Catholic Mass, Orthodox liturgies, and some Protestant services. It also rejected heretical Arian claims that Christ was a created being who lacked an eternal divine nature and rather confirmed that the Son is eternally begotten of the Father.

The council was called by Emperor Constantine — a convert to Christianity — less than 15 years after the empire halted the persecution of Christians and granted them the freedom to worship. It came just 20 years after the reign of Emperor Diocletian, who brutally persecuted Christians for their rejection of paganism.

“That council represents a fundamental stage in the development of the creed shared by all the Churches and ecclesial communities,” Pope Leo XIV said in May, acknowledging the 1,700th anniversary.

“While we are on the path towards the reestablishment of full communion among all Christians, we recognize that this unity can only be unity in faith,” the pontiff said.

The Arian heresy

The primary purpose of the council was to settle a major question about Christ’s divine nature and address Arianism, which was a heresy promoted by the priest Arius asserting that Jesus Christ was a created being and not eternal.

“Arius began to preach something that was scandalous to many Christian believers and [which] seemed incompatible to the Christian faith as witnessed to in Scripture and transmitted through the tradition of the Church,” Dominican Father Dominic Legge, the director of the Thomistic Institute and a professor of theology, told CNA.

Arius wrote in “Thalia” that he believed the Father “made the Son” and “produced him as a son for himself by begetting him.” He wrote that “the Son was not always [in existence], for he was not [in existence] before his generation.” He asserted that Christ was not eternal but “came into existence by the Father’s will.” Arius contested that Christ “is not true God” but was rather “made God by participation.”

Legge said that Arius understood that “there’s an infinite gap between God and creatures,” but where he was mistaken was that “he thought that the Son was on the ‘creature’ side of that gap” and “not equal in divinity to God.”

“Therefore, he considered him to be the highest creature,” Legge added. “The first creature, but nonetheless a creature.”

Legge said that at Nicaea there was “a consensus of bishops with very different approaches to the mystery of God and they could see that Arius had to be wrong and so they condemned him and they affirmed that the Son is ‘God from God, true God from true God.’”

The language adopted at Nicaea expressly contradicted Arius, affirming Christ is “true God from true God, begotten not made, of one substance with the Father.” It condemned Arius’ view as heresy. The vote was nearly unanimous with more than 300 bishops voting in favor of this text and only two siding with Arius.

St. Athanasius, one of the most outspoken opponents of Arianism at the council and in its aftermath, wrote in his “First Discourse Against the Arians” in the mid-fourth century that “the Scriptures declare the Son’s eternity.”

Athanasius notes, for example, the Gospel of St. John states that “in the beginning was the Word, and the Word was with God, and the Word was God.” He also cites Chapter 8 of the same Gospel in which Christ declares “before Abraham was, I am,” invoking the divine name used by God to indicate his eternity when appearing to Moses as the burning bush.

“The Lord himself says, ‘I am the Truth,’ not ‘I became the Truth,’ but always, ‘I am — I am the Shepherd — I am the Light‘ — and again, ‘Call me not, Lord and Master? And you call me well, for so I am,‘” Athanasius wrote. “Who, hearing such language from God, and the Wisdom, and Word of the Father, speaking of himself, will any longer hesitate about the truth, and not immediately believe that in the phrase ‘I am,‘ is signified that the Son is eternal and without beginning?”

Legge noted that Athanasius also warned that Arius’ position “threatened the central truth of Christianity that God became man for our salvation.”

Unifying the Church in the fourth century

Prior to the Council of Nicaea, bishops in the Church held many synods and councils to settle disputes that arose within Christianity.

This includes the Council of Jerusalem, which was an apostolic council detailed in Acts 15, and many local councils that did not represent the entire Church. Regional councils “have a kind of binding authority — but they’re not global,” according to Thomas Clemmons, a professor of Church history at The Catholic University of America.

When the Roman Empire halted its Christian persecution and Emperor Constantine converted to the faith, this allowed “the opportunity to have a more broad, ecumenical council,” Clemmons told CNA. Constantine embraced Christianity more than a decade before the council, though he was not actually baptized until moments before his death in A.D. 337.

Constantine saw a need for “a certain sense of unity,” he said, at a time with theological disputes, debates about the date of Easter, conflicts about episcopal jurisdictions, and canon law questions.

“His role was to unify and to have [those] other issues worked out,” Clemmons said.

The pursuit of unity helped produce the Nicene Creed, which Clemmons said “helps to clarify what more familiar scriptural language doesn’t.”

Neither the council nor the creed was universally adopted immediately. Clemmons noted that it was more quickly adopted in the East but took longer in the West. There were several attempts to overturn the council, but Clemmons said “it’s later tradition that will affirm it.”

“I don’t know if the significance of it was understood [at the time],” he said.

The dispute between Arians and defenders of Nicaea were tense for the next half century, with some emperors backing the creed and others backing Arianism. Ultimately, Clemmons said, the creed “convinces people over many decades but without the imperial enforcement you would expect.”

It was not until 380 when Emperor Theodosius declared that Nicene Christianity was the official religion of the Roman Empire. One year later, at the First Council of Constantinople, the Church reaffirmed the Council of Nicaea and updated the Nicene Creed by adding text about the Holy Spirit and the Church.

Common misconceptions

There are some prominent misconceptions about the Council of Nicaea that are prevalent in modern society.

Clemmons said the assertion that the Council of Nicaea established the biblical canon “is probably the most obvious” misconception. This subject was not debated at Nicaea and the council did not promulgate any teachings on this matter.

Another misconception, he noted, is the notion that the council established the Church and the papacy. Episcopal offices, including that of the pope (the bishop of Rome), were already in place and operating long before Nicaea, although the council did resolve some jurisdictional disputes.

Other misconceptions, according to Clemmons, is an asserted “novelty” of the process and the teachings. He noted that bishops often gathered in local councils and that the teachings defined at Nicaea were simply “the confirmation of the faith of the early Church.”

This story was first published on June 5, 2025, and has been updated.

Pope Leo XIV and Ecumenical Patriarch Bartholomew I of Constantinople at an ecumenical event marking the 1,700th anniversary of Nicene Creed, in Iznik, Turkey, on Nov. 28, 2025. / Credit: Vatican Media/Screenshot

Iznik, Turkey, Nov 28, 2025 / 08:05 am (CNA).

Pope Leo XIV commemorated the 1,700th anniversary of the First Council of Nicaea on Friday in the Turkish city historically known as the birthplace of the Nicene Creed, calling Christians to overcome “the scandal of divisions” and to renew their commitment to unity.

The pope spoke during an ecumenical prayer service held at the archaeological site of the ancient Basilica of St. Neophytos on the shore of Lake Iznik, southeast of Istanbul. The gathering marked one of the most symbolic moments of his apostolic visit to Turkey, which has focused heavily on ecumenical and interreligious outreach.

“We are all invited to overcome the scandal of divisions,” he said, urging Christians to nurture “the desire for unity for which the Lord Jesus prayed and gave his life.”

Pope Leo and Ecumenical Patriarch Bartholomew I, considered first among equals among Eastern Orthodox bishops, were welcomed by two senior Orthodox bishops before proceeding to a platform beside the submerged ruins of the basilica. The two leaders stood before icons of Christ and of the council and lit candles together.

Iznik, formerly Nicaea, is located about 81 miles southeast of Istanbul. The remains of an early Christian basilica dedicated to St. Neophytos, a young martyr killed in 303 during the persecutions of Diocletian, were first identified in 2014 after aerial photographs revealed the outline of a submerged church. The basilica collapsed during an earthquake in 740, and its ruins are now visible from the lakeshore.

In his homily, Leo said the anniversary was “a precious opportunity to ask ourselves who Jesus Christ is in the lives of men and women today, and who he is for each one of us personally.” He cautioned against reducing Christ to “a kind of charismatic leader or superman,” recalling Arius’ denial of Christ’s divinity and the council’s defense of the full humanity and full divinity of Jesus.

“If God did not become man, how can mortal creatures participate in his immortal life?” the pope asked, emphasizing what was at stake in the fourth-century debate.

Leo said the Nicene confession of faith remains a foundation for unity among Christians worldwide. Quoting the creed, he underlined the proclamation of Christ as “consubstantial with the Father,” describing it as “a profound bond already uniting all Christians.” Citing St. Augustine, he added: “Although we Christians are many, in the one Christ we are one.”

A reconciled Christianity, he continued, can “bear credible witness to the Gospel” and offer “a proclamation of hope for all.”

The pope also extended his appeal for fraternity beyond the Christian world, insisting that authentic recognition of God as Father requires honoring all people as brothers and sisters. He warned against using religion “to justify war, violence, or any form of fundamentalism or fanaticism,” and called instead for “fraternal encounter, dialogue, and cooperation.”

Pope Leo’s schedule in Turkey includes a series of ecumenical events, among them the signing of a joint declaration with Patriarch Bartholomew I on Nov. 29 at the Patriarchal Palace. His trip also carries an interreligious dimension. Earlier on Friday he met the chief rabbi of Turkey, discussing the visit as a sign of peace and support for all religious communities. On Saturday, Nov. 29, he will visit the Sultan Ahmed Mosque.

IZNIK, Turkey (CNS) -- Although the ancient city of Nicaea lies in ruins and the geographic center of Christianity has shifted West, Pope Leo XIV and Christian leaders gathered at an archaeological site in Turkey to celebrate the enduring faith set out in the Nicene Creed.

Orthodox Ecumenical Patriarch Bartholomew of Constantinople hosted the ecumenical prayer service and the common recitation of the Creed Nov. 28 at Iznik, site of the ancient Nicaea, about 80 miles southeast of Istanbul.

With the Greek Orthodox patriarchs of Antioch, Alexandria and Jerusalem or their representatives and with representatives of other Orthodox, Anglican and Protestant churches, Pope Leo marked the 1,700th anniversary of the Council of Nicaea -- the primary motive for his first foreign trip as pope. 

The joint recitation of the Creed did not include the phrase known as the "filioque" -- the statement that the Holy Spirit "proceeds from the Father and the Son" -- since the phrase is not used by the Orthodox because it was inserted into the Latin Creed by Pope Benedict VIII in 1014.

Recent popes, including Pope Benedict XVI, Pope Francis and Pope Leo, have omitted the phrase at ecumenical prayer services.

Standing on a platform overlooking the remains of the Basilica of St. Neophytos, now partially submerged in Lake Iznik, the church leaders took turns leading the prayers -- in English, Greek and Arabic -- and lighting candles as a Catholic choir, singing in Latin, and an Orthodox choir, singing in Greek, alternated. 

Patriarch Bartholomew, welcoming the pope and other guests, noted that "despite so many intervening centuries and all the upheavals, difficulties and divisions they have brought, we nevertheless approach this sacred commemoration with shared reverence and a common feeling of hope."

"The power of this place does not reside in what passes away, but in what endures forever," he said.

Speaking after the patriarch, Pope Leo told his fellow Christian leaders that at a time when humanity is "afflicted by violence and conflict," the world "is crying out for reconciliation."

"The desire for full communion among all believers in Jesus Christ is always accompanied by the search for fraternity among all human beings," he said. "In the Nicene Creed, we profess our faith 'in one God, the Father.' Yet, it would not be possible to invoke God as Father if we refused to recognize as brothers and sisters all other men and women, who are created in the image of God." 

Though united by faith, the Russian Orthodox Church -- the largest of the world's Eastern Orthodox churches -- was not represented at the service. The Russian church broke relations with the Ecumenical Patriarchate over the recognition in 2018 of the autonomy of the Ukrainian Orthodox Church. 

Belief in God the father, Pope Leo said in Iznik, means "there is a universal fraternity of men and women regardless of ethnicity, nationality, religion or personal perspectives."

With many of the Christian leaders, especially the Oriental Orthodox, coming from nations that recently faced or are facing war and persecution, Pope Leo said Christians must give concrete witness to their belief that all people are children of one God and therefore brothers and sisters to each other.

"Furthermore, we must strongly reject the use of religion for justifying war, violence or any form of fundamentalism or fanaticism," he said. "Instead, the paths to follow are those of fraternal encounter, dialogue and cooperation."

The pope also repeated a concern he had mentioned during a meeting with Catholic leaders earlier in the day: the risk that many Christians have departed from the Nicene Creed's firm belief in the divinity of Jesus.

"This question is especially important for Christians, who risk reducing Jesus Christ to a kind of charismatic leader or superman, a misrepresentation that ultimately leads to sadness and confusion," he said.

At the time of the Council of Nicaea, the pope said, Arius -- a priest from Alexandra in Egypt -- had denied the divinity of Christ, reducing him to "a mere intermediary between God and humanity, ignoring the reality of the Incarnation such that the divine and the human remained irremediably separated."

"But if God did not become man, how can mortal creatures participate in his immortal life?" Pope Leo asked.

The pope told the Christian leaders that sharing the same faith in Jesus and being able to recite the Creed together means there "is a profound bond already uniting all Christians."

"We are all invited to overcome the scandal of the divisions that unfortunately still exist and to nurture the desire for unity for which the Lord Jesus prayed and gave his life," the pope said. "The more we are reconciled, the more we Christians can bear credible witness to the Gospel of Jesus Christ, which is a proclamation of hope for all."

Patriarch Bartholomew told the leaders that with "the fervor of the faith of Nicaea burning in our hearts," they must "run the course" of Christian unity in fulfillment of Jesus' prayer for the unity of his disciples.

"And, finally," the patriarch said, "let us love one another that with one mind we may confess: Father, Son and Holy Spirit -- Trinity consubstantial and undivided."
 

Pope Leo XIV visits a care home for the elderly run by a community of the Little Sisters of the Poor in Istanbul, Turkey, on Nov. 28, 2025. / Credit: Vatican Media

Istanbul, Turkey, Nov 28, 2025 / 03:00 am (CNA).

Pope Leo XIV visited the Nursing Home of the Little Sisters of the Poor in Istanbul on Friday, telling the community that Christian charity begins not with doing but with being — i.e., living a real communion with those one serves.

“The secret of Christian charity is that before being for others, we must first be with others in a communion based on fraternity,” he said during the encounter on Nov. 28, the second day of his apostolic trip to Turkey, where he is marking the 1,700th anniversary of the First Council of Nicaea.

A papal stop at a charitable institution has become customary during international journeys, and Pope Leo chose to spend time with the elderly as a sign of closeness to those often marginalized in modern societies.

Founded in France in 1839 by St. Jeanne Jugan, the Little Sisters of the Poor serve elderly people in need around the world, including in Turkey, where they welcome residents of different religious backgrounds. The pope was greeted at the residence by the mother superior, former superior, and provincial leader before proceeding to the chapel to meet residents, staff, and benefactors.

Reflecting on the congregation’s name, the pope told the sisters that their mission mirrors the life of Christ himself. “The Lord has called you not only to assist or help the poor but has also called you to be their ‘sisters.’ You are to be like Jesus, whom the Father sent to us not only to help and serve us but also to be our brother.”

Turning to the residents, he warned that the word “elderly” risks losing its meaning in cultures driven by efficiency and materialism. Such attitudes, he said, lead societies to forget the dignity and value of older persons. Scripture and tradition, by contrast, present the elderly as bearers of memory and wisdom.

“As Pope Francis loved to repeat — the elderly are the wisdom of a people, a treasure for their grandchildren, families, and society as a whole,” he said.

Pope Leo concluded by thanking the community for its patient, prayerful witness and prayed that the Lord would strengthen all who live and serve in the home.

Pope Leo XIV encourages Catholic clergy, religious brothers and sisters, and lay pastoral workers to see the Catholic community’s small size as a strength during an encounter at the Cathedral of the Holy Spirit in Istanbul, Turkey, on Nov. 28, 2025. / Credit: Vatican Media

Istanbul, Turkey, Nov 28, 2025 / 01:55 am (CNA).

Pope Leo XIV encouraged Turkey’s small Catholic community Friday to rediscover what he called the Gospel’s “logic of littleness,” urging them not to be discouraged by their tiny numbers but to recognize in them the strength of authentic Christian witness.

The pope addressed bishops, priests, religious, pastoral workers, and laypeople at the Cathedral of the Holy Spirit in Istanbul on his second day in the country. Catholics in Turkey make up roughly 0.05% of the nation’s 85 million people.

Calling Turkey a “holy land” where the Old and New Testaments meet, the pope recalled the deep Christian roots of the region: Abraham’s journey through Harran, the early Christian communities in Antioch and Ephesus, and the long and influential history of Byzantine Christianity. He noted in particular that the Ecumenical Patriarchate of Constantinople, currently led by Patriarch Bartholomew I, remains “a point of reference” both for its Greek faithful and for other Orthodox churches.

The pope warned Christians not to treat this heritage merely as a memory of past greatness. Instead, he urged them to adopt “an evangelical vision” that sees their present reality through the Holy Spirit’s light.

“When we look with God’s eyes, we discover that he has chosen the way of littleness,” he said, pointing to the mustard seed, the little ones praised by Jesus, and the quiet growth of the kingdom of God. The Church’s true strength, he explained, “does not lie in her resources or structures,” nor in numbers or influence, but in remaining gathered around Christ and sent by the Holy Spirit.

Quoting Jesus’ words “Do not be afraid, little flock,” the pope encouraged Christians in Turkey to cultivate hope. He pointed to the growing number of young people approaching the Catholic Church as a sign of promise and asked communities to continue welcoming and accompanying them.

He urged particular dedication to ecumenical and interreligious dialogue, the transmission of the faith to local communities, and pastoral service to refugees and migrants — many of whom are among the most vulnerable people in the country. The pope also noted that many Catholics in Turkey come from abroad, a reality that calls for a deeper process of inculturation so that the language and culture of the country become “more and more your own.”

The pope highlighted Turkey’s unique role in the history of the Church, recalling that the first eight ecumenical councils were held on its soil. Marking the 1,700th anniversary of the First Council of Nicaea, he said the council continues to pose three questions to Christians today: What is the essence of the faith? Who is Jesus for us? And how should doctrine be expressed in ways that speak to contemporary culture?

He warned against what he described as a “new Arianism,” a version of the heresy that divided Christianity in its early centuries, that reduces Jesus to a moral teacher or heroic figure while denying his divinity and lordship over history.

Before concluding, the pope invoked the memory of St. John XXIII, who served in Turkey and wrote affectionately of its people. Reflecting on the saint’s image of Bosporus fishermen laboring through the night, he encouraged Turkish Catholics to persevere in the same spirit: working faithfully, joyfully, and courageously “in the Lord’s boat.”

The Cathedral of the Holy Spirit, where the meeting took place, was built in 1846 and houses relics of early popes, including St. Linus. A statue of Pope Benedict XV stands in its courtyard, erected in gratitude for his efforts to help victims of the 1915–1918 war. The inscription honors him as a “benefactor of peoples, without distinction of nationality or religion.”

Watch Pope Leo XIV’s full homily here.

Workers erect the Vatican’s 2025 Christmas tree in St. Peter’s Square on Thursday, Nov. 27, 2025. / Credit: Vatican Media

Vatican City, Nov 27, 2025 / 14:30 pm (CNA).

A towering Christmas tree now stands in the center of St. Peter’s Square after the spruce arrived at the Vatican on Thursday morning. 

The 88-foot-tall spruce tree from Italy’s Bolzano province was erected next to the ancient Egyptian obelisk that stands in the middle of the 17th-century Baroque square designed by Gian Lorenzo Bernini.

This year, the northern Italian municipalities of Lagundo and Ultimo gifted the Christmas tree to the Vatican. The tree was harvested in the alpine valley of Ultimo.

In an Oct. 20 interview published on the Vatican State website, Bishop Ivo Muser of the Diocese of Bolzano-Bressanone said the tree reaffirms the local Church’s “spiritual and emotional bond” with the pope. 

“It is a way of saying: ‘We are with you, Pope Leo; we wish to pray with you and share the joy of Christmas with you,” he said.

“The tree thus becomes an ‘ambassador’ of our territory, our culture, and our faith — a way of bringing a small piece of our local Church into the heart of the universal Church,” he added.

The Vatican’s large-scale Nativity display — donated by the Italian Diocese of Nocera Inferiore-Sarno — is currently under construction behind covered fencing in St. Peter’s Square.

The highly-awaited 2025 Nativity scene will honor St. Alphonus Maria de Liguori, whose remains lie in the southern Italian diocese. In Italy, St. Alponsus is famous for composing the famous Italian Christmas carol “Tu scendi dalle stelle” (“From Starry Skies Descending”).

Bishop Giuseppe Giudice of the Diocese of Nocera Inferiore-Sarno said the Nativity project for the Vatican, which involved a “long period of preparation,” will also showcase local Neapolitan Christmas traditions.  

“I am happy to say that everyone working on the project is from our wonderful region, and the Nativity scene will be rich in elements typical of our local Agro Nocerino-Sarnese area,” he said in an Oct. 24 interview published by Vatican City State.  

The Vatican will hold a special ceremony on Dec. 7 at 6:30 p.m. local time to present the Christmas tree and Nativity scene to the public. The display will be open to the public until mid-January 2026.