Christian History

The Ecumenical Councils

The ecumenical councils were gatherings of bishops from across the whole church to settle major questions of belief. The first four, Nicaea (325), Constantinople (381), Ephesus (431), and Chalcedon (451), worked out how to confess Jesus faithfully: fully God and fully man, one person in two natures. Together they gave the church the shared vocabulary of orthodox Christian faith held by Catholics, Orthodox, and Protestants alike.

What is an ecumenical council?

'Ecumenical' means 'from the whole inhabited world'. These councils brought bishops together to resolve disputes that threatened the unity and truth of the faith. Different traditions recognize different numbers of them: the Eastern Orthodox and Catholic churches count seven early councils, the Catholic Church counts further later ones, and most Protestants especially honor the first four. The first four are shared ground.

The first four councils

Nicaea (325) affirmed that the Son is 'of one substance' with the Father, truly God, against Arius. Constantinople (381) reaffirmed Nicaea and confessed the full deity of the Holy Spirit, completing the creed we now call the Nicene Creed. Ephesus (431) affirmed that Jesus is one person, so that Mary can be called 'Theotokos', the God-bearer, meaning the one she bore is truly God, against Nestorius. Chalcedon (451) gave the classic statement that Jesus is one person in two natures, fully God and fully man, 'without confusion, without change, without division, without separation'.

The doctrine of Christ

The councils were not adding to the Gospel but guarding it. Scripture presents Jesus as truly divine (John 1) and truly human (Hebrews 2), and the councils found careful words to hold both together without denying either. That balance, fully God and fully man, one Christ, is the heart of Christian faith about Jesus.

It is worth noting honestly that not every church accepted every council. After Chalcedon, the Oriental Orthodox churches (such as the Coptic and Armenian) separated over its wording, though modern dialogue has found much of the difference to be more about language than substance. Where Christians have differed, it is fair to say so.

What this means for us

These councils are the reason Christians around the world, in vastly different cultures, still confess the same Jesus. They are a gift of clarity. Behind all the careful words stands something simple and stunning: the God who made all things came among us as one of us, to save us. That is worth confessing carefully, because it is worth everything.

Frequently asked questions

What were the four great ecumenical councils?

Nicaea (325) affirmed the Son is truly God; Constantinople (381) confessed the full deity of the Holy Spirit; Ephesus (431) affirmed Jesus is one person; and Chalcedon (451) confessed him as one person in two natures, fully God and fully man.

What did the Council of Chalcedon teach about Jesus?

Chalcedon (451) confessed that Jesus Christ is one person in two natures, fully God and fully man, united 'without confusion, without change, without division, without separation'. This remains the classic statement of orthodox belief about Christ.

Do all Christians accept the same councils?

Not entirely. The Orthodox and Catholic churches recognize seven early councils, Catholics recognize more later ones, and most Protestants especially honor the first four. The Oriental Orthodox churches parted after Chalcedon, largely over wording. The first four councils are broadly shared.