Nicaea I — First Ecumenical Council
Nicaea confesses the Son as true God, of one essence with the Father, against Arian subordination.
Historical context
Alongside its confession about the Son and its disciplinary canons, Nicaea seeks agreement about celebrating Easter. The synodal letter to the Egyptians reports that agreement; Constantine's circular, preserved by Eusebius, presents an imperial account of its significance. These are different documents and voices.
Perspective note
Shared subject; this bundled record was originally written with an Orthodox-informed editorial lens.
Key points
- The twenty surviving numbered canons are not a detailed algorithm for computing Easter.
- The synodal letter is direct evidence that a common observance was sought.
- Constantine's circular in Life of Constantine III.17-20 is an imperial interpretation, not interchangeable with the council's creed or canons.
People
- Constantine
- Alexander of Alexandria
- Athanasius
- Arius
Primary sources
The creed confesses the Son:
The Nicene creed confesses the Son as of one substance with the Father.
being of one substance (ὁμοούσιον, consubstantialem) with the Father
Passage context and translation
The council uses the term homoousios to confess the Son's full divinity against Arian claims that the Son is a creature.
Before the excerpt
very God of very God, begotten (γεννηθέντα), not made,
After the excerpt
By whom all things were made, both which be in heaven and in earth.
Sources and further reading
- Nicaea: creed, twenty canons, and synodal letter
Henry Percival's NPNF translation prints the distinct documents. The letter's announcement is not a twenty-first numbered calculation canon. - Constantine's circular on the council and Easter
Read the claim of unity and the hostile rhetoric critically. Eusebius's praise of the emperor and Constantine's words are distinct from conciliar legislation. - OCA: The Seven Ecumenical Councils
Retained introduction to Orthodox reception; the original Christological overview remains unchanged.