First Council of Nicaea

First Council of Nicaea
The Council of Nicaea, with Arius depicted as defeated by the council, lying under the feet of Emperor Constantine. The Hagia Sophia is in the background of the icon.
DateMay to August 325
Accepted by
Next council
First Council of Constantinople
Convoked byEmperor Constantine I
PresidentHosius of Corduba
Attendance
  • 318 (traditional number)
  • 250–318 (estimates) – only five from Western Church
TopicsArianism, the nature of Christ, celebration of Passover, ordination of eunuchs, prohibition of kneeling on Sundays and from Easter to Pentecost, validity of baptism by heretics, lapsed Christians, sundry other matters
Documents and statements
Original Nicene Creed, 20 canons, and a synodal epistle
Chronological list of ecumenical councils

The First Council of Nicaea (/nˈsə/ ny-SEE; Ancient Greek: Σύνοδος τῆς Νίκαιας, romanized: Sýnodos tês Níkaias) was a council of Christian bishops convened in the Bithynian city of Nicaea (now İznik, Turkey) by the Roman Emperor Constantine I. The Council of Nicaea met from May until the end of July 325.

This ecumenical council was the first of many efforts to attain consensus in the church through an assembly representing all Christendom. Hosius of Corduba may have presided over its deliberations. Attended by at least 200 bishops, its main accomplishments were the settlement of the Christological issue of the divine nature of God the Son and his relationship to God the Father, the construction of the first part of the Nicene Creed, the mandating of uniform observance of the date of Easter, and the promulgation of early canon law.