06/16/2026
THE ECUMENICAL COUNCIL OF NICAEA, AD 325
June 12
The first Council of Nicaea was convened in the early summer of 325 by the Roman Emperor Constantine at what is today Isnuk, Turkey. The emperor presided at the opening of the council. The council ruled against the Arians, who taught that Jesus was not the eternal Son of God but was created by the Father and was called Son of God because of his righteousness. The chief opponents of the Arians were Alexander, bishop of Alexandria, and his deacon, Athanasius. The council confessed the eternal divinity of Jesus and adopted the earliest version of the Nicene Creed, which in its entirety was adopted at the Council of Constantinople in 381.
"Forasmuch as the great and holy Synod, which was assembled at Nicaea through the grace of Christ and our most religious Sovereign Constantine, who brought us together from our several provinces and cities, has considered matters which concern the faith of the Church, it seemed to us to be necessary that certain things should be communicated from us to you in writing, so that you might have the means of knowing what has been rejected and investigated, and also what has been decreed and confirmed.
"First, then, in the presence of our most religious Sovereign Constantine, investigation was made of matters concerning the impiety and transgression of Arius and his adherents. And it was unanimously decreed that he and his impious opinion should be anathematized, together with the blasphemous words and speculations in which he indulged, blaspheming the Son of God, and saying that He is from things that are not, and that before He was begotten He was not, and that there was a time when He was not, and that the Son of God is by His free will capable of vice and virtue; saying also that He is a creature. All these things the holy Synod has anathematized, not even enduring to hear his impious doctrine and madness and blasphemous words."
—The Synodal Letter from the First Ecumenical Council of Nicaea
The Nicene Creed
I believe in one God the Father Almighty,
Maker of heaven and earth,
And of all things visible and invisible:
And in one Lord Jesus Christ, the only-begotten Son of God,
Begotten of his Father before all worlds,
God of God, Light of Light,
Very God of very God,
Begotten, not made,
Being of one substance with the Father,
By whom all things were made;
Who for us men, and for our salvation came down from heaven,
And was incarnate by the Holy Ghost of the Virgin Mary,
And was made man,
And was crucified also for us under Pontius Pilate.
He suffered and was buried,
And the third day he rose again according to the Scriptures,
And ascended into heaven,
And sitteth on the right hand of the Father.
And he shall come again with glory to judge both the quick and the dead:
Whose kingdom shall have no end.
And I believe in the Holy Ghost,
The Lord and giver of life,
Who proceedeth from the Father and the Son,
Who with the Father and the Son together is worshipped and glorified,
Who spake by the Prophets.
And I believe one Catholic and Apostolic Church.
I acknowledge one Baptism for the remission of sins.
And I look for the Resurrection of the dead,
And the life of the world to come.
Amen.