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Who was St. Hilary of Poitiers?

St. Hilary of Poitiers was a Gallo-Roman theologian and bishop of Poitiers, Gaul (in what is now France), who was known for championing orthodoxy against Arianism, a 4th-century heresy that disputed the sameness of essence of the Son and the Holy Spirit with God the Father. He was the first Latin writer to introduce Greek doctrine to Western Christendom and was later named a doctor of the church.