First Council of Nicaea

First Council of Nicaea
16th-century fresco depicting the Council of Nicaea
DateMay to August A.D. 325
Accepted by
Previous council
Council of Jerusalem (Pre-ecumenical)
Next council
Council of Serdica and the ecumenical First Council of Constantinople
Convoked byEmperor Constantine I
PresidentHosius of Corduba
Attendance318 (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.[1]
Documents and statements
Original Nicene Creed,[2] 20 canons,[3] and a synodal epistle[1]
Chronological list of ecumenical councils

The First Council of Nicaea (ə/; Greek: Νίκαια [ˈnikεa]) was a council of Christian bishops convened in the Bithynian city of Nicaea (now İznik, Turkey) by the Roman Emperor Constantine I in AD 325.

This ecumenical council was the first effort to attain consensus in the church through an assembly representing all of Christendom. Hosius of Corduba, who was probably one of the papal legates, may have presided over its deliberations.[4][5]

Its main accomplishments were settlement of the Christological issue of the divine nature of God the Son and his relationship to God the Father,[2] the construction of the first part of the Nicene Creed, establishing uniform observance of the date of Easter,[6] and promulgation of early canon law.[3][7]


Eastern Orthodox icon depicting the First Council of Nicaea

The First Council of Nicaea was the first ecumenical council of the church.[8] Most significantly, it resulted in the first uniform Christian doctrine, called the Nicene Creed. With the creation of the creed, a precedent was established for subsequent local and regional councils of bishops (synods) to create statements of belief and canons of doctrinal orthodoxy—the intent being to define unity of beliefs for the whole of Christendom.[citation needed]

Derived from Greek (Ancient Greek: οἰκουμένη, romanizedoikouménē, lit. 'the inhabited one'), "ecumenical" means "worldwide" but generally is assumed to be limited to the known inhabited Earth, (Danker 2000, pp. 699–670) and at this time in history is synonymous with the Roman Empire; the earliest extant uses of the term for a council are Eusebius' Life of Constantine 3.6[9] around 338, which states "he convoked an ecumenical council" (Ancient Greek: σύνοδον οἰκουμενικὴν συνεκρότει, romanizedsýnodon oikoumenikḕn synekrótei)[10] and the Letter in 382 to Pope Damasus I and the Latin bishops from the First Council of Constantinople.[11]

One purpose of the council was to resolve disagreements arising from within the Church of Alexandria over the nature of the Son in his relationship to the Father: in particular, whether the Son had been 'begotten' by the Father from his own being, and therefore having no beginning, or else created out of nothing, and therefore having a beginning.[12] St. Alexander of Alexandria and Athanasius took the first position; the popular presbyter Arius, from whom the term Arianism comes, took the second. The council decided against the Arians overwhelmingly (of the estimated 250–318 attendees, all but two agreed to sign the creed and these two, along with Arius, were banished to Illyria).[8][13]

Another result of the council was an agreement on when to celebrate Easter, the most important feast of the ecclesiastical calendar, decreed in an epistle to the Church of Alexandria in which is simply stated:

We also send you the good news of the settlement concerning the holy pasch, namely that in answer to your prayers this question also has been resolved. All the brethren in the East who have hitherto followed the Jewish practice will henceforth observe the custom of the Romans and of yourselves and of all of us who from ancient times have kept Easter together with you.[14]

Historically significant as the first effort to attain consensus in the church through an assembly representing all of Christendom,[15] the Council was the first occasion where the technical aspects of Christology were discussed.[15] Through it a precedent was set for subsequent general councils to adopt creeds and canons. This council is generally considered the beginning of the period of the First seven Ecumenical Councils in the History of Christianity.[citation needed]

Other Languages
Bahasa Indonesia: Konsili Nicea I
Lingua Franca Nova: Prima Consilio de Nicea
Simple English: First Council of Nicaea
slovenščina: Prvi nicejski koncil
srpskohrvatski / српскохрватски: Prvi nikejski sabor
Tiếng Việt: Công đồng Nicaea I