Main (Thompson) Library location: End window -- North wing. Marc Locqueneulx (15-- – 1589) worked as a bookseller and printer in Paris during the late sixteenth century. Due to similarities in printer's mark and engravings, it is possible that he was the successor of the firm of Philippe Gaultier de Roville. The first known work attributed to Locqueneulx is entitled La vraye et entiere histoire des troubles et guerres civiles avenues de nostre temps and is dated to 1573. Following the production of such a historical compilation, Locqueneulx published more than twenty books over the course of his relatively short career. Locqueneulx's mark in the Vassar Library is comprised of his first initial, an uppercase M, surmounted by a four-mark and two horizontal bars; just above his initial is a closed circle. In other versions of his mark, the right post of the M extends horizontally to form an L. Additionally, it is clear that Locqueneulx modified the device of his master Philippe Gaultier in his fuller versions. These include illustrations of two entwined snakes lunging upward toward a sheaf of wheat on a pedestal, customarily encircled by an architectural border. To Gaultier's original design, Locqueneulx added flanking seraphim and the Latin inscription Sacra concordia, prudentia comes, meaning "sacred harmony, friend of wisdom."