Saints & Church Fathers
St. Gregory the Theologian (329-390)
Archbishop of Constantinople, one of the Three Holy Hierarchs. One of only three saints given the title 'Theologian' (with St. John the Evangelist and St. Symeon the New Theologian). His Five Theological Orations are the definitive exposition of Trinitarian doctrine. Feast: January 25.
Sources
- St. Gregory the Theologian, Orations 27-31 (Theological Orations) the Theological Orations
- St. Gregory, Oration 38 (On the Theophany)