Faliase is where William the Conqueror was born. William became Duke of Normandy when he was just a boy. He went on to become the first Norman king of England in 1066. Falaise was where many of the dukes of Normandy resided before William. It is where the Treaty of Falaise was signed in December 1174. It was a treaty between William I of Scotland, King of Scots, and the King of England Henry II Plantagenet.