The Council of Nicaea Writes the First Creed
Bishops summoned by Constantine settle, on paper, whether Christ was equal to God the Father
Quick facts
- Convened by
- Emperor Constantine
- Year
- 325 CE
- Rejected teaching
- Arianism (Christ as created, not co-eternal)
- Output
- The Nicene Creed, 20 canons
What happened
Constantine convened bishops from across the empire at Nicaea in 325 CE to resolve a dispute that had split the church: the Alexandrian priest Arius taught that Christ, as the Son, was created by God the Father and therefore not equal to him or co-eternal, a position most bishops at the council rejected. The council produced the Nicene Creed, declaring belief in Christ as of one substance with the Father, begotten not made, and formally anathematizing anyone who taught that the Son was created or of a different substance from the Father. The council also issued twenty canons on church discipline, covering matters from clerical conduct to the standing of bishops.
Why it matters
Nicaea was the first attempt to settle Christian doctrine through an empire-wide gathering of bishops backed by imperial authority rather than through informal consensus, and the Arian controversy it aimed to end persisted in various forms for decades afterward, showing how difficult that kind of doctrinal closure actually was to achieve.
How we know
The Nicene Creed and the council's twenty canons survive in multiple manuscript copies preserved through the Nicene and Post-Nicene Fathers textual tradition, cross-checked against later church historians who describe the council's proceedings.
Sources
- Internet History Sourcebooks Project, Fordham University. The Creed of Nicaea · Primary source (author-declared)sourcebooks.fordham.edu · Cited as a "primary" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
- Christian History Institute. 325 The First Council of Nicea · Reputable sourcechristianhistoryinstitute.org · The domain "christianhistoryinstitute.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
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Part of a timelineHistory of Christianity28 events · A crucified Jewish teacher, a persecuted sect that became an empire's official religion, and two thousand years of councils, schisms, and missions that carried it to every continentView all →