The 381 Council of Constantinople solidified Trinitarian doctrine, affirmed the Holy Spirit’s divinity, and reshaped the ...

This year, the universal Church celebrates the 1,700th anniversary of the Council of Nicaea, the first ecumenical council ...

Pope Leo I tangled with Attila the Hun and won. Pope Leo III crowned Charlemagne as the first Holy Roman Emperor. This is the ...

But the new pope, in 2025, has done something more than mark an anniversary. By choosing the name “Leo” and explicitly ...

A quiet yet symbolically significant gathering took place on May 17 at the Coptic Orthodox Patriarchate in Cairo.

Istanbul marked the 1,700th anniversary of the First Council of Nicaea, the groundbreaking gathering convened in 325 by ...

So far, Pope Leo XIV has leaned fairly heavily into the legacy of his storied predecessor, Leo XIII, but he reflects Leo X.

Who’s Pope Leo?Five past pontiffs and how they ... This document became a foundational text at the Council of Chalcedon in 451, which firmly established the doctrine of the two natures of ...

Pope Leo I oversaw the Ecumenical Council at Chalcedon, which, among other things, reaffirmed the orthodox Christian teaching that Jesus Christ had both a human and divine nature. However ...

Indeed, the first Pope Leo — known as Leo the Great — served 440-461. He is best known as the pope who persuaded Attila the Hun to turn back from the invasion of Italy. His thinking was also central ...