Guillaume Evrard, Evrandi, Eurardi, Eurart, Euerard, whom we must not confuse with Erart, received first rank for the license in theology on December 31, 1429, and does not appear as master until March A, 1437.

From March 24 to June 23, 1430, he was rector of the University. We find him as "teacher of the nephew of Monsignor," the archbishop of Rouen. The Chapter gave him 10 livres when he won over the grammarians of Navarre. Guillaume Evrard is referred to as master of the arts students and he accompanied the archbishop's nephew and books to Rouen. In 1434, he is to be found as curé of the church of Saint Pierre des Arcis in la Cité, and in 1441 he attempted to become curé of Saint Gervais de Paris.

From 1440 he was principal of the Collège of Navarre, the old house of learning that had been pillaged by the Burgundians in 1418, and which inspired the great university reform. He became canon of Nôtre Dame on April 12, 1458, and he continued his teaching by virtue of a decree of Bâle and of the Pragmatic.

He died on November 6, 1470.

Gérard Machet, confessor of Charles VII and an examiner of Jeanne at Poitiers, presents him in his correspondence as a man "of a very illustrious virtue and a wisdom almost celestial." He declared to him the pleasure he had had in receiving him at Castres and denied having heard calumnies concerning him.

His rôle in the Trial is limited to his having been present at the session of March 3, when he did not say a word. Guillaume Evrard left shortly afterward, with other University masters, for the Council of Bâle, where he arrived between the ninth and twelfth of April.