-243151872. Richard I 'The Fearless' Count Duke of Normandy
Still a boy when William died, powerless to stop Louis IV of France when he seized Normandy.
Kept in confinement in Laon, but escaped. Allied himself with Norman/Viking leaders and took back Normandy in 947.
Introduced the feudal system to Normandy, carried out a major reorganization of the Norman military, based on heavy cavalry.