Event

First Council of Nicaea

325 · 4th century · Also known as Council of Nicaea

The First Council of Nicaea was a gathering of Christian bishops called by the emperor Constantine I at Nicaea in Bithynia in 325. It condemned the teaching of Arius, adopted the Nicene Creed, which declared the Son to be of one substance with the Father, and set a common rule for the date of Easter. It is counted as the first ecumenical council of the church.

First Council of Nicaea
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Cite this entry
APA
The Epoch Institute. (2026). First Council of Nicaea. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/first-council-of-nicaea
MLA
“First Council of Nicaea.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/first-council-of-nicaea. Accessed .
Chicago
The Epoch Institute. “First Council of Nicaea.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/first-council-of-nicaea.
Harvard
The Epoch Institute (2026) ‘First Council of Nicaea’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/first-council-of-nicaea (Accessed: ).

Last reviewed October 2026Random entry ↻