In 933, Sark was included in the Duchy of Normandy, based on the traditional boundaries of the Lugdunensis secunda and the archbishopric of Rouen. Following the Norman conquest of England in 1066, the island was united with the Crown of England. In the thirteenth century, the French pirate Eustace the Monk, having served King John, used Sark as a base of operations.
In 933, Sark was included in the Duchy of Normandy base,d on the traditional boundaries of the Lugdunensis secunda and the archbishopric of Rouen. Following the Norman conquest of England in 1066, the island was united with the Crown of England. In the thirteenth century, the French pirate Eustace the Monk, having served King John, used Sark as a base of operations.