First Council of Nicaea (325)
Background
Key figures
What was condemned
Arianism (the teaching that the Son is a created being, not eternally God)
What was defined
The Son is homoousios (of one essence) with the Father — origin of the Nicene Creed
Aftermath and reception
Primary sources
- Full primary texts (definition + canons, NPNF2-14): nicaea_i_325