Following their settlement in the north of France, the Normans sought to consolidate their territorial gains in what was to become known as Normandy. They did this by building a series of castles and fortifications. Duke William's desire to hold down his lords, and his efforts to crush opposition to his minority also led to a number of famous sieges at castles such as Brionne, Arques and Alencon. This book discusses the Norman castles in Normandy, as well as in the Mediterranean, where at Melfi and Ademo in Italy and Sicily, Sahyun and Bagras in the Principality of Antioch they also left their mark.