St. Hilary of Poitiers

A married convert from paganism elected bishop of Poitiers around 350, Hilary was the West's most determined defender of Nicene orthodoxy against Arianism, and was exiled to Phrygia for four years for refusing to condemn Athanasius. His treatise On the Trinity carried the Eastern Fathers' trinitarian theology into the Latin world.

During his exile Hilary immersed himself in the Greek theological tradition, attending the Council of Seleucia in 359 and sharpening his arguments against the Arians on their own ground. He returned to Gaul not broken but emboldened, rallying the Western bishops and earning from Jerome the title "the Rhône of Latin eloquence."

He composed the earliest known Latin hymns, planting seeds for the great liturgical tradition that would flower in Ambrose and beyond. He died peacefully at Poitiers around 367, and was declared a Doctor of the Church in 1851 — honored as the man who kept the Western Church anchored to the faith of Nicaea when nearly every current ran against it.