Pope Leo issued an apostolic letter titled, “In Unitate Fidei” (“In the Unity of Faith”), ahead of his first official ...

COMMENTARY: The council profoundly advanced our understanding of what we believe in ways that can immensely help our ...

Pope Leo XIV’s historic trip to Turkey and Lebanon brought renewed hope for Christian unity as he marked the 1,700th ...

This year, Christians around the world are celebrating the 1,700th anniversary of the Council of Nicaea, held in 325 A.D. We ...

Each Sunday and solemnity, following a period of reflection after the homily, we recite or chant the Creed. There are two ...

This raucous meeting, which took place exactly 1700 years ago, was one of the most important in Christian history. Icon depicting the Emperor Constantine and the fathers of the Council of Nicaea of ...

The new American pontiff has been far more reserved than his outspoken predecessor. But many of their underlying progressive messages remain the same.

As he had done throughout his visit to Turkey, Pope Leo XIV spent his last morning in the country reaffirming the Catholic ...

Centuries of church schisms show that if there’s a doctrine to be fought over, there’s a good chance Christians will fight about it. That repeated splintering is what makes the Council of Nicaea — a ...

The Latest: Pope Leo XIV to call for Christian unity at site where Nicaean Creed establishedBy The Associated PressThe Associated PressPope Leo XIV marks a high point of his first foreign trip to ...

The prayer marked the highlight of Pope Leo XIV's visit to Turkey and the main reason for his trip, the first of his pontificate.