Many sacred beliefs of our Catholic faith can be traced to the 21 ecumenical councils held since the fourth century.

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

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

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

When someone accepts election as pontiff, there undergoes a change in that individual, not only in life purpose in leading ...

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

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 ...

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 ...

At the headquarters of the Ecumenical Patriarchate in Istanbul, Orthodox clergy and faithful welcomed the May 8 election of Pope Leo XIV, hoping he would build on the ecumenical progress made by his ...