Gisors, a town of Normandy, France, in the department of Eure, in a fertile plain on the banks of the Epte, 33 m. E. S. E. of Rouen; pop. in 1800, 3,753. It is surrounded by gar-dons and beautiful promenades formed upon the remains of its ancient ramparts. Its castle, most of which is still standing, was very strong, and one of the chief fortresses of Normandy. It was built about the 11th century, but the donjon, an enclosed octagonal structure crowning a high artificial mound, was constructed in the 12th century by Henry II. of England. Under one of the towers is a dungeon, the walls of which are covered with carvings executed with a nail by some unknown prisoner. The parish church is filled with grotesque sculptures. The choir is said to have been built by Blanche of Castile.