Wire of a senator patrician, Hilaire was born in Poitou. It cultivated its sharp intelligence by traversing Italy and Greece; its sensitivity grew rich in contact with the beauties of nature. There but it could not limit its happiness, its goal was the search of the truth. Hilaire studies the prophets and reads the Gospel. It embraces the doctrines of Jesus-Christ and is made baptize. It does not think any more but of exhorter the men with becoming saints. It converts his wife and her daughter. Become bishop of Poitiers, Hilaire, grouping other bishops, will draw up itself against the heresy arienne protected by the Constance emperor. Outlaw, it exclaims: " One can exile the bishops well, but can one exile the truth ". bottom of Phrygie, the large one exiled writes inlassablement: " One cannot retain captive the word of God ". In twelve books, it establishes its Treaty of the Trinity. It studies the theology of the East. Here it is returned in Gaule, because Ariens fear its growing influence. Its presence, with the council of Séleucie where it asked a public meeting to confuse the bishops heretic, was for them a blow terrible.Son return in Poitiers is a triumph; a young soldier is there, who will become the Great Martin Saint. Miracles fill with enthusiasm the people; but the apostle suffers from the devastations made by the heresy arienne; he gathers councils, goes to Milan to fight it. Exhausted, it returns to Poitiers where it dies. Saint Hilaire is the first Doctors of the Church in Gaule. By him, the Occident was initiated with the monastic life.