The present Château de La Roche-Guyon was built in the 12th century, controlling a river crossing of the Seine. In the mid-13th century, a fortified manor house was added below. Guy de La Roche fell at the Battle of Agincourt, and his widow was ousted from the Roche, after six months of siege, in 1419; she preferred to depart rather than accept Henry Plantagenet as her overlord. It came to the Liancourt family with the marriage of Roger de Plessis-Liancourt to the heiress Marie de La Roche; he was a childhood companion of Louis XIII, first gentleman of the Chambre du Roi, and was made a duke in 1643. He and his wife made great changes to the château-bas, opening windows in its structure and laying out the terrace to the east, partly cut into the mountain's steep slope.
The domain of La Roche-Guyon came to the La Rochefoucauld family in 1669, with the marriage of Jeanne-Charlotte de Plessis-Liancourt with François VII de La Rochefoucauld. The Château retained its medieval aspect of a fortress, with its moat and towers and cramped, dark living apartments. The Château was largely extended in the 18th century.
After D-Day in World War II, German Field Marshal Erwin Rommel defended Normandy against the Allies in World War II from a bunker located here. The castle also was Rommel's headquarters.
Restorations and archaeological surveys undertaken after 1990 by the Conservatoire régional des Monuments historiques revealed new additions to the documentary history of La Roche-Guyon, undertaken in the 19th century by Hippolyte Alexandre and Emile Rousse.
References:Saint-Georges de Boscherville Abbey is a former Benedictine abbey. It was founded in about 1113 by Guillaume de Tancarville on the site of an earlier establishment of secular canons and settled by monks from the Abbey of Saint-Evroul. The abbey church made of Caumont stone was erected from 1113 to 1140. The Norman builders aimed to have very well-lit naves and they did this by means of tall, large windows, initially made possible by a wooden ceiling, which prevented uplift, although this was replaced by a Gothic vault in the 13th century. The chapter room was built after the abbey church and dates from the last quarter of the 12th century.
The arrival of the Maurist monks in 1659, after the disasters of the Wars of Religion, helped to get the abbey back on a firmer spiritual, architectural and economic footing. They erected a large monastic building one wing of which fitted tightly around the chapter house (which was otherwise left as it was).