Note 031 If Theophilus, bishop of Antioch (see Dupin, Bibliotheque Ecclesiastique, tom. i. p. 66), was the first who employed the word Triad, Trinity, that abstract term, which was already familiar to the schools of philosophy, must have been introduced into the theology of the Christians after the middle of the second century.

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Note to Chapter 21 of Decline and Fall by Gibbon