Queras, Mathurin a French controversialist, was born at Sens, Aug. 1, 1614, studied theology at Paris, where he obtained the doctorate, and was attached to the Sorbonne. He was a Jansenist in proclivity, and in 1656 refused to abandon the Port-Royalists even on the threat of being ousted from his professorship. He was rewarded for his consistency by the archbishop of Sens, who made Queras one of his grand vicars and placed him at the head of his theological seminary. In 1674, upon the death of his protector, Queras was obliged to retire to Troyes, and became prior of St. Quentin. He spent the remainder of his life, like the Port-Royalists, in retirement and penitence. He died April 9, 1695. His most important works is Eclarcissement de cette Celebre et importante Question, referring to the decisions of the Council of Trent on the dogmas of justification and grace (Paris, 1683, 8vo), in which he takes ground against the council. — Hoefer, Nouv. Biog. Generale, s.v.