In the summer of 325 AD, in the small city of Nicaea in Asia Minor (modern-day İznik, Turkey), more than two hundred bishops from across the Roman world gathered at the invitation of Emperor Constantine I. It was the first time in Christian history that bishops from so many regions had assembled in one place, and the meeting would become known as the First Ecumenical Council — the Council of Nicaea.
The Arian Controversy
The council was called to resolve a bitter theological dispute that had split congregations across the empire. A priest from Alexandria named Arius had been teaching that Jesus Christ, the Son of God, was a created being — that there was a time when the Son did not exist, and that he was therefore not co-eternal with God the Father. To Arius, the Son was the highest of God’s creatures, but a creature nonetheless.
This teaching, known as Arianism, alarmed many bishops, including Alexander of Alexandria and his young deacon Athanasius, who argued that if the Son were not fully divine, then Christ could not truly reconcile humanity to God. The dispute had grown so heated that it was causing riots in the streets of Alexandria and Constantinople, and Constantine — who had only recently legalized Christianity and wanted a unified church to help unify his empire — decided the matter needed to be settled once and for all.
The Emperor Convenes the Bishops
Constantine paid the traveling expenses of the bishops and hosted the council in the imperial palace at Nicaea. While Constantine was not a bishop and did not vote on doctrine, his presence gave the council unprecedented authority and set a precedent for the close relationship between church and state that would define much of the following millennium. Estimates of attendance range from 220 to over 300 bishops, the vast majority from the Greek-speaking East, though a handful of Western bishops and two representatives of the Bishop of Rome also attended.
The Nicene Creed
After weeks of debate, the council overwhelmingly rejected Arius’s teaching and produced a creed declaring that the Son is “of one substance” (in Greek, homoousios) with the Father — true God from true God, begotten, not made. This single word, homoousios, became the theological line in the sand between orthodox Christianity and Arianism. All but two of the bishops present signed the creed; Arius and his few remaining supporters were excommunicated and exiled.
The council also addressed a number of practical matters, including a uniform date for celebrating Easter and rules governing the authority of bishops in major sees such as Alexandria, Antioch, and Rome.
A Controversy That Would Not Die
Nicaea did not end the Arian controversy. Arianism continued to have powerful supporters, including several later emperors, and the theological battle raged for another half-century until it was finally resolved at the Council of Constantinople in 381, which reaffirmed and expanded the Nicene Creed into the form still recited in churches today: the Nicene-Constantinopolitan Creed.
Why Nicaea Still Matters
The Council of Nicaea set the template for how the church would resolve major disputes for the next fifteen centuries: gather the bishops, debate the question, and issue a binding statement of faith. It also fused the fate of Christian doctrine with the political power of the Roman state in a way that would shape church history — for better and worse — through the Byzantine Empire, the medieval papacy, and beyond. Nearly every Christian tradition today, Catholic, Orthodox, and Protestant, still confesses the Nicene Creed as a foundational statement of faith.
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