ATHIS-MONS

town, southern suburb of Paris, in Essonne dpartement, northern France. Athis-Mons lies near the confluence of the Orge and Seine rivers. It was ancient Attegais, later Athis-sur-Orge, where a treaty of that name was signed in 1305 between the king of France and the count of Flanders. A Romanesque bell tower survives from the 12th-century Priory of Saint-Denis. A medieval chateau is now used as a secondary school. Orly Airport (international) adjoins the town to the north. Pop. (1982) 35,618; (1990) 36,337.