Church Document
First Council of Nicaea
Ecumenical Council · 325
The first ecumenical council, convened by Emperor Constantine in 325. It condemned Arianism and defined that the Son is consubstantial (homoousios) with the Father — true God from true God — promulgating the original form of the Nicene Creed. It also fixed a common method for calculating the date of Easter.
Key themes
- Arianism condemned
- Divinity of Christ
- Nicene Creed
- Date of Easter
Document type
Council document
Issuing authority
Catholic Church
Issued date
325