Reigned 1135-1154. He siezed the throne from Matilda who invaded England in 1139. The civil war that followed proved him a brave soldier but revealed his lack of political sense. In 1152, after much of the country had been ravaged in factional fighting and the royal administration had broken down, Stephen recognized Matilda's son Henry as heir to the throne. Duke of Normandy 1135-1144, deposed. Duke of Blois, Count of Mortain, Count of Boulogne.