Andelys, Les(lāzäNdəlē`), town (1993 est. pop. 8,580), in Eure dept., N France, Normandy, on the Seine. The twin communities of Grand-Andely and Petit-Andely form a commercial center, with a distillery, metalworks, glassworks, and silk and leather industries. On the border between Normandy proper and the Norman VexinVexin
, region of N France. It is mainly agricultural, with some industry in the valleys. By the Treaty of Saint-Clair-sur-Epte (911), the northernmost part (Vexin Normand) was assigned to Rollo of Normandy; the rest (Vexin Français) remained with the French crown.
..... Click the link for more information. , it was of considerable strategic importance in the Middle Ages. The impressive Château Gaillard was built (1197) by Richard I of England.