First Council of Nicaea

The first ecumenical council, summoned by Constantine, defined the Son as homoousios — of the same essence as the Father — against Arius. The Nicene Creed dates from this gathering.

Figures involved

constantine the great
athanasius of alexandria
arius

Eusebius, Vita Constantini 3.6–14

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Cover of On the Holy Spirit by Basil of Caesarea

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On the Holy Spirit

Basil of Caesarea

A reading pick tied to today's figure, quote, era, or event. Basil gives the mature Cappadocian defense of the Spirit's divinity after Nicaea.

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