Pope Leo XIV marks Nicaea anniversary, urges Christians to overcome divisions

Iznik, Turkey, Nov 28, 2025 / 08:05 am

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.