(ancient Jullobona), a manufacturing town of France, department of Seine-Inferieure, situate at the foot of a wooded eminence on the Bolbec, an affluent of the Seine, 19 miles E. of Havre. Its appearance is dull and uninteresting, and most of the houses are constructed of wood. There are numerous cotton mills, and several tanneries in and around the town, and a brisk trade is carried on in leather, groceries, hardware, and cattle. In ancient times this was the chief town of the Caleti; and, as the remains testify, must have been one of the chief cities in Gallia Belgica. Traces of a Latin theatre exist close to the town. Near these remains is an old castle, once the residence of William the Conqueror, and where, it is said, he divulged to the assembled barons his scheme for the invasion of England. The only other building of mark is the parish church, surmounted by an elegant Gothic spire. Pop. 4300.