By NICOLE WINFIELD, ANDREW WILKS and MEHMET GUZEL, Associated Press

IZNIK, Turkey (AP) — Pope Leo XIV joined Eastern and Western patriarchs and priests Friday in commemorating an important anniversary in Christian history, gathering at the site in Turkey of an unprecedented A.D. 325 meeting of bishops to pray that Christians might once again be united.

Pope Leo XIV meets the clergy at the Cathedral of the Holy Spirit, in Istanbul, Turkey, Friday, Nov. 28, 2025. (AP Photo/Domenico Stinellis)

Pope Leo XIV, left, and Ecumenical Patriarch Bartholomew I, the spiritual leader of the world’s Eastern Orthodox Christians arrive for an Ecumenical prayer service at archaeological excavations of the ancient Byzantine-era Christian Saint Neophytos Basilica, in Iznik, Turkey, Friday, Nov. 28, 202

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