First Council of Nicaea

Year: 325

Outcome: The council denounced Arianism and issued the Nicene Creed, affirming the Son is of one substance (homoousios) with the Father.

Recognized by:

• Roman Catholic Church

• Eastern Orthodox Churches

• Oriental Orthodox Churches

• Anglican Church

• Lutheran Churches

• Assyrian Church of the East

Topics discussed:

• Arianism

• Baptism

• Christology

• Lapsi

• Ordination

• Paschal Controversies

• Trinity

Heresies addressed: Arianism

Opponents: Arius

Ruling popes: Pope Saint Sylvester I

Ruling patriarchs:

• Pope Saint Sylvester I

• Alexander of Constantinople

• Pope Alexander of Alexandria

• Saint Eustathius

• Macarius of Jerusalem

Ruling emperors:Constantine the Great (Roman)

Council conveners:Constantine the Great

Council presidents: Hosius of Corduba

Other key figures:

• Arius

• Athanasius of Alexandria

• Caecilian

• Eusebius

• Eusebius of Nicomedia

• Saint Jacob of Nisibis

• Leontius of Caesarea

• Saint Nicholas

• Saint Paphnutius

• Potamion of Heraclea

• Protogenes of Serdica

• Saint Spyridon

Number in attendance: 318

Location: Nicaea

Church council documents:

• The First Ecumenical Council

• Nicene Creed

• Canons

• Arabic Canons Later Attributed to the Council of Nice

• Synod Letter

• Letter to those Unable to Attend the Council[1]

[1]Parks, J. (2022). Ecumenical Councils. Faithlife.