Note 332 — IX CHRISTIANITY
Reading edition
Theophilus, Ad Autol. 2, 15 (c. 180 a.d.), is the first among our extant Greek sources to use the word Trinity (τριάς) of the nature of God; Tertullian, Adv. Valent. 17 (c. 200), the first Latin writer to employ trinitas in the same sense.