(Dom Thomas), a Benedictine of the congregation of St Vaast and St Hidulphe, whose knowledge was an ornament to his order. It gained him also the titles of antiquarian, librarian, and counsellor, to Charles duke of Lorraine. He was preparing a very considerable work when he died, A.D. 1763, before he had put his last hand to his book, which was published by Abbé Jacquin. This production appeared in 1763, in folio, with this title: Introduction à la science des Médailles, pour servir à la connaissance des Dieux, de la Religion, des Sciences, des Arts, et de tout ce qui appartient à l'Histoire ancienne, avec les preuves tirées des Médailles. The elementary treatises on the numismatic science were not sufficiently extensive, and the particular dissertations were by far too tedious and prolix. This learned Benedictine has collected into a single volume all the principles contained in the former, and all the ideas of any consequence which which are to be found scattered through the latter. His work may serve as a supplement to Montfaucon's Antiquity explained. From Mangeart we likewise have a volume of sermons; and a treatise on Purgatory, Nancy, 1739, 2 vols. 12mo.