Built back in 1097 by William II, King of England and son of William the Conqueror, this castle was further fortified in the 12C by Henry II before being taken by Philippe Auguste of France in 1193. During the Hundred Years War the castle changed hands several times before returning to the French crown in 1449. A public garden has been laid out inside the fortified perimeter where the 11C keep still stands, flanked by a watchtower and surrounded by a sturdy wall. There is a fine view of Gisors from the terrace.