An upstart French duke who sets out to conquer the most powerful and unified kingdom in Christendom. An invasion force on a scale not seen since the days of the Romans. One of the bloodiest and most decisive battles ever fought. This new history explains why the Norman Conquest was the most significant cultural and military episode in English history. Assessing the original evidence at every turn, Marc Morris goes beyond the familiar outline to explain why England was at once so powerful and yet so vulnerable to William the Conqueror's attack; why the Normans, in some respects less sophisticated, possessed the military cutting edge; how William's hopes of a united Anglo-Norman realm unraveled, dashed by English rebellions, Viking invasions, and the insatiable demands of his fellow conquerors.