The 381 Council of Constantinople solidified Trinitarian doctrine, affirmed the Holy Spirit’s divinity, and reshaped the Nicene Creed, marking a turning point in early Christian theology.

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

and it is one of the reasons why the Council of Nicaea has pride of place in church history, along with the Council of Chalcedon, in the estimation of most Christian historians and theologians.

The Nicene confession of faith is recognized today as an ecumenical trait d’union that no later schism or heresy has been ...

was actually issued by the Council of Chalcedon 126 years later in 451 CE. So, the Council of Nicaea taught that there was never a time when He was not. Jesus Christ is fully divine, therefore eternal ...

Pope Leo XIV greets Orthodox Metropolitan Emmanuel of Chalcedon, a bishop of the Orthodox Ecumenical Patriarchate, during a ...

Icon depicting the Emperor Constantine and the fathers of the Council of Nicaea of 325 with the Greek text of the Nicene-Constantinopolitan Creed of 381 in its liturgical form. Artist unknown.

This month, 1,700 years ago, was one of the most significant and consequential events in all of Church history.

One significant decision at Nicaea was the date of the celebration of the Feast of the Resurrection, which at that time, and prior to the council was marked at different dates by different church ...

For Catholics, however, answers to these questions were provided at an event that commenced 1,700 years ago this May: the Council of Nicaea, at which more than 300 assembled bishops affirmed that ...