Les Halles was the traditional central market of Paris. In 1183, King Philippe II Auguste enlarged the marketplace in Paris and built a shelter for the merchants, who came from all over to sell their wares. The church of Saint-Eustache was constructed in the 16th century. The circular Halle des Blés (grain exchange), designed by Nicolas Le Camus de Mézières, was built between 1763 and 1769 at the west end of Les Halles. Its circular central court was later covered with a dome, and it was converted into the Bourse de Commerce in 1889