Pope Leo XIV and Ecumenical Patriarch Bartholomew I, the spiritual leader of the world's Eastern Orthodox Christians, attend the Doxology at the Patriarchal Church of Saint George, in Istanbul, Türkiye (29 Nov. 2025). Photo credit: AP/Emrah Gurel

Pope Leo XIV and Ecumenical Patriarch Bartholomew of Constantinople hand each other copies of a joint declaration they signed at the end of a prayer service in the Patriarchal Cathedral of St. George in Istanbul (29 Nov. 2025). Photo credit: CNS/Lola Gomez

Pope Leo XIV and Ecumenical Patriarch Bartholomew I sign a joint declaration at the Ecumenical Patriarchate during the pope’s first apostolic journey, in Istanbul, Türkiye (29 Nov. 2025). Photo credit: OSV News/Dilara Senkaya, Reuters

Christian leaders gathered at the site of the First Council of Nicaea in modern-day Iznik, Türkiye (28 Nov. 2025). Photo credit: Vatican Media

The procession during the ecumenical prayers at the site of the First Council of Nicaea in modern-day Iznik, Türkiye (28 Nov. 2025). Photo credit: Vatican Media

Pope Leo XIV and Ecumenical Patriarch Bartholomew lead a prayer service near the archaeological excavations of the ancient Basilica of St. Neophytos in Iznik, Türkiye (28 Nov. 2025). Photo credit: AP/Domenico Stinellis

Pope Leo XIV waves to the people as he arrives at the Cathedral of the Holy Spirit in Istanbul during his first foreign trip (28 Nov. 2025). Photo credit: AP/Emrah Gurel

Pope Leo XIV joins Ecumenical Patriarch Bartholomew and other Christian leaders for an ecumenical prayer service in Iznik, Türkiye. The gathering marked the 1,700th anniversary of the Council of Nicaea, convened in 325 A.D., which produced the Nicene Creed and defined foundational Christian doctrine (28 Nov. 2025). Photo credit: CNS/Lola Gomez

Pope Leo XIV gives his blessing to people attending Mass for the Jubilee of Choirs and the feast of Christ the King in St. Peter's Square at the Vatican. At the end of Mass, the pope announced the release of his apostolic letter, 'In Unitate Fidei' ('In the Unity of Faith') on the Creed and the 1,700th anniversary of the Council of Nicaea (23 Nov. 2025). Photo credit: CNS/Vatican Media

Pope Leo XIV speaks to visitors and pilgrims after Mass for the feast of Christ the King and the Jubilee of Choirs in St. Peter’s Square at the Vatican. The pope announced he was releasing 'In Unitate Fidei' ('In the Unity of Faith'), marking the 1,700th anniversary of the Council of Nicaea and its Creed (23 Nov. 2025). Photo credit: CNS/Lola Gomez

Pope Leo XIV speaks to visitors and pilgrims attending Mass for the Jubilee of Choirs and the feast of Christ the King in St. Peter’s Square at the Vatican. At the end of Mass, the pope announced the release of his apostolic letter, 'In Unitate Fidei' ('In the Unity of Faith') on the Creed and the 1,700th anniversary of the Council of Nicaea (23 Nov. 2025). Photo credit: CNS/Vatican Media

Cardinal Víctor Manuel Fernández, prefect of the Dicastery for the Doctrine of the Faith, presents the doctrinal note 'Mater Populi Fidelis' ('Mother of the Faithful People of God') on Mary’s cooperation in the work of salvation, at the Jesuit headquarters in Rome (4 Nov. 2025). Photo credit: CNS/Lola Gomez

Pope Leo XIV attends an ecumenical Christian prayer service inside Rome's Colosseum, before joining representatives of other religions outside to appeal for peace. The pope is standing between Greek Orthodox Patriarch Theodore II of Alexandria and Catholicos Awa III, patriarch of the Assyrian Church of the East (28 Oct. 2025). Photo credit: CNS/Vatican Media

Pope Leo XIV celebrates Mass in St. Peters with participants in the Jubilee of Synodal Teams (26 Oct. 2025). Photo credit: CNS/Vatican Media

An ecumenical prayer service was held today in the Sistine Chapel with Pope Leo XIV and Archbishop Stephen Cottrell (York, UK) on the occasion of the state visit of King Charles III (23 Oct. 2025). Photo credit: Vatcian Media

Pope Leo XIV with Britain's King Charles III in the St. Damasus Courtyard at the Vatican after a state visit and prayer in the Sistine Chapel (23 Oct. 2025). Photo credit: AP/Andrew Medichini

Pope Leo XIV places a crown on a statue of Mary and the Child Jesus during a meeting with participants in the Jubilee of the Roma, Sinti, and Travelling Peoples in the Paul VI Audience Hall at the Vatican (18 Oct. 2025). Photo credit: CNS/Vatican Media

The members of ARCIC III gathered in Melbourne, Australia for their annual meeting (11 Oct. 2025). Photo credit: Neil Vigers/ACO

The Rt Revd and Rt Hon Dame Sarah Mullally DBE to become 106th Archbishop of Canterbury (2 Oct. 2025). Photo credit: Lambeth Palace

Pope Leo XIV greets participants of a symposium in Rome (7 June 2025). Photo credit: CNA/Vatican Media

Pope Leo XIV meets with Orthodox Ecumenical Patriarch Bartholomew of Constantinople at the Vatican. The patriarch will host Pope Leo at several prayer services and meetings Nov. 28-30, including a prayer service marking the anniversary of the Council of Nicaea (30 May 2025). Photo credit: CNS/Vatican Media

Pope Leo XIV greets Patriarch Bartholomew of Constantinople during an audience with ecumenical guests on the day after the inaugural Mass of of his papacy (19 May 2025). Photo credit: CNS/Vatican Media

A Statement from the Director of the Anglican Centre in Rome and the Archbishop of Canterbury's Representative to the Holy See (9 May 2025). Photo credit: Anglican Centre in Rome

Pope Leo XIV appears on the loggia in St. Peter's Basilica after his election as the 267th pope and bishop of Rome (8 May 2025). Photo credit: AP/Bernat Armangue