Pope Leo XIV marks a high point of his to Turkey with a pilgrimage to the site where early Christian church leaders met 1,700 years ago under the auspices of the Roman Emperor Constantine to host the .

Leo will pray with Ecumenical Patriarch Bartholomew, spiritual leader of the world’s Orthodox Christians, at the site of the 325 AD gathering, now the town of Iznik, and sign a joint declaration in a show of Christian unity.

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