Primary source
To Autolycus 2.15
Late second-century apology containing the earliest surviving use of the Greek word trias for God, his Word, and his Wisdom.
Citation
Theophilus of Antioch, To Autolycus 2.15, translated by Marcus Dods, Ante-Nicene Fathers, vol. 2.
Use
Used to show that the word for a divine triad was in Christian use by about AD 180, more than a century before Nicaea.