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Council of Nicaea

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

Council of Nicaea: 1,700 Years of Christian Unity amid Division

Nov 28, 2025

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 Protestants.

Pope Leo XIV meets with a U.S. ecumenical group led by Cardinal Joseph Tobin and Greek Orthodox Archbishop Elpidophoros of America on July 17, 2025, at the Vatican, encouraging them to “return to the roots of our faith” in their pilgrimage to Italy and Turkey. / Credit: Vatican Media

Pope Leo XIV Calls Christians to Ecumenism to be Architects of Reconciliation and Peace

Aug 22, 2025

Pope Leo XIV issued an ecumenical appeal to all Christians to be architects of reconciliation and peace throughout the world on the occasion of Ecumenical Week.

Sr. Olga Massango and Fr. William Owire. Credit: Paulines Publications Africa (PPA)

Nicaea Council’s 1700th Anniversary: Catholic Priest in Kenya Proposes Workshops, Seminars on Nicene Creed

Jun 18, 2025

The Provincial Superior of the Society of the Divine Word (SVD) members in Kenya and Tanzania has proposed conventions to deliberate on the Nicene Creed as the Church commemorates the 1,700th anniversary of the Ecumenical Council of Nicaea.

Pope Leo XIV greets participants of the symposium “Nicaea and the Church of the Third Millennium: Towards Catholic-Orthodox Unity" in Rome, Saturday, June 7, 2025 / Credit: Vatican Media

At Ecumenical Symposium, Pope Leo XIV Says Catholic Church Open to Universal Easter Date

Jun 7, 2025

The pope spoke at the symposium “Nicaea and the Church of the Third Millennium: Towards Catholic-Orthodox Unity,” which took place this week at the Pontifical University of Saint Thomas Aquinas in Rome.

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

Vatican Releases Document to mark 1,700th Anniversary of First Council of Nicaea

Apr 3, 2025

The International Theological Commission has published “Jesus Christ, Son of God, Savior: The 1,700th Anniversary of the Ecumenical Council of Nicaea.”

A recent meeting of various members of the ecumenical initiative Easter Together 2025. / Credit: Courtesy of Easter Together 2025

Ecumenical Initiative Calls for Unity to Celebrate Easter Together

Feb 15, 2025

This year both Easters — Catholic and Orthodox — fall on the same date, April 20, due to the alignment of the Julian and Gregorian calendars.

“If the devil divides, the creed unites!” the pope said in his Feb. 6, 2025, remarks to a visiting group of priests and monks of the Oriental Orthodox churches, including Armenian, Coptic, Ethiopian, Eritrean, Malankar, and Syriac. / Credit: Vatican Media

Pope Francis Reiterates Desire for "full unity" among Christians

Feb 6, 2025

“The proclamation of the common faith requires, first of all, that we love one another,” the Holy Father said in a Feb. 6 audience with Oriental Orthodox priests and monks.

Pope Francis presides over vespers at the Basilica of St. Paul Outside the Walls, accompanied by masters of ceremonies, marking the conclusion of the Week of Prayer for Christian Unity, Jan. 25, 2025. / Credit: Daniel Ibáñez/CNA

Pope Sees "providential" Moment as Catholics, Orthodox Hope They Could Celebrate Easter Together in 2025

Jan 25, 2025

Pope Francis emphasized that hope is “always possible” in Jesus Christ during an ecumenical vespers service marking both the Week of Prayer for Christian Unity

Pope Francis and Archbishop of Canterbury Justin Welby exchange greetings with other Christian leaders at an ecumenical second vespers at the Basilica of St. Paul Outside the Walls in Rome on the feast of the Conversion of St. Paul, Jan. 25, 2024. / Credit: Daniel Ibañez/CNA

Rome to Host Ecumenical Vigil during Week of Prayer for Christian Unity

Jan 16, 2025

On Jan. 25, the feast of the Conversion of St. Paul, Pope Francis will conclude the week with vespers in St. Paul Outside the Walls Basilica at 5:30 p.m. Rome time.

Pope Francis meets with Ecumenical Patriarch Bartholomew I at the Vatican, Oct. 4, 2021. / Vatican Media.

A Path Towards Unity: Pope Francis Proposes Joint Catholic-Orthodox Celebration of Nicaea Anniversary

Nov 30, 2024

The letter was delivered by Cardinal Kurt Koch during his visit to Istanbul for the patronal feast of the Orthodox Church.

Pope Francis speaks to members of the International Theological Commission at the Vatican on Thursday, Nov. 28, 2024. / Vatican Media

Pope Francis Confirms Plans to Visit Turkey for Historic Nicaea Council Anniversary

Nov 28, 2024

The Council of Nicaea took place in the ancient city of Nicaea in 325 A.D. in the former Roman Empire, which is now the present-day city of İznik, in northwestern Turkey

Pope Francis meets with Ecumenical Patriarch Bartholomew I at the Vatican, Oct. 4, 2021. / Credit: Vatican Media

Orthodox Patriarch Anticipates Pope Francis Visit to Turkey for Council of Nicaea Anniversary

May 17, 2024

Pope Francis might be traveling to Turkey next year for the 1,700th anniversary of the First Council of Nicaea, according to Patriarch Bartholomew.

Pope Francis meets with ecumenical delegation from Finland on Jan. 17, 2022. Vatican Media

Pope Francis Looks Ahead to the 1700th Anniversary of the Council of Nicaea in 2025

Jan 17, 2022

Pope Francis highlighted the upcoming anniversaries of two major events in Church history as moments that can help Christians seek unity.