The Château de Rosny-sur-Seine is a château in the Louis XIII style, situated in Rosny-sur-Seine in Yvelines, on the left bank of the Seine, at a short driving distance from Paris by the road to Rouen. It is famous as the seat of Maximilien de Béthune, duc de Sully, who retired to the old château to heal from his wounds at the battle of Ivry, 1590, and constructed the present building on old foundations in the closing years of the 16th century. It went through several substantial alterations in the 19th and 20th centuries, and a period of neglect in the 1980s and 1990s.