Hilary of Poitiers (c. 315–367) is one of the greatest of the Western church fathers, but he is the least studied. His work, De Trinitate , in response to Arianism (and also Sabellianism), is a meticulously profound piece of theology, constructed with great passion and enthusiasm for the clear teaching of the Faith—the triunity of God. So, why then is he not as well-known nor well received as others? For one, he was a Westerner, so his Latin tongue did not find its way over the Eastern church walls. His work on the Trinity seemed more of a detailed and lengthy response to an epistle from an Arian, which soon deteriorated and was forgotten about. His writing style and form of argumentation is challenging to follow and use for instruction. Furthermore, Hilary’s work was soon overshadowed by a later, masterful work on the Trinity from none other than St. Augustine. Hilary, though an original thinker, was not a great systematician nor did he order his thoughts in a clear and organized mann