Council · 381 · 9 July
First Council of Constantinople
Constantinople I finished what Nicaea had started. The council reaffirmed the Son's full divinity and answered those who denied the Holy Spirit's divinity, giving the church the expanded Nicene-Constantinopolitan Creed. That is the creed most Christians mean when they say 'the Nicene Creed' today. The result was a clearer Trinitarian grammar: one God, Father, Son, and Holy Spirit.
At a glance
- Type
- Council
- Date remembered
- 9 July, AD 381
- What kind of event is this?
- A council or settlement that changed the church's public teaching, discipline, or historical direction.
- Key line
- One God: Father, Son, and Holy Spirit.
Highlights
- Reaffirmed Nicaea.
- Confessed the Spirit's divinity.
- Expanded the creed.
- Closed the main Trinitarian controversy.
How it happened
What happened
Theodosius called Eastern bishops to Constantinople after decades of conflict over the Nicene faith.
The argument
The council had to reaffirm Nicaea and answer groups that denied the Holy Spirit's full divinity.
What changed
The creed was expanded into the form most Christians now know as the Nicene Creed.
Why it matters
Constantinople gave the church stable language for confessing Father, Son, and Holy Spirit as one God.
Aftermath
Its creed became the central ecumenical creed of Catholic, Orthodox, and many Protestant churches.
People in the story
Gregory of Nazianzusc. 329 – 390Cappadocian Father, briefly Archbishop of Constantinople (380-381) and presider over the First Council of Constantinople. Known as 'the Theologian' for his Five Theological Orations.
Gregory of Nyssac. 335 – c. 395Younger brother of Basil and the third Cappadocian Father. Author of the Life of Moses, Catechetical Oration, and Life of Macrina.Recommended reading
Primary texts from figures tied to this event.
Gregory of Nazianzus
Five Theological Orations · 380
Constantinople sermons that earned him the title 'the Theologian' — defining Trinitarian orthodoxy.
Gregory of Nazianzus
Orations · 380
45 surviving sermons; sets the standard for patristic homiletics.
Gregory of Nyssa
The Life of Moses · 390
Allegorical reading of Moses as the model of Christian spiritual progress.
Gregory of Nyssa
Catechetical Oration · 385
Comprehensive catechism of Christian faith for instructing pagans and heretics.