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After the division of the Duchy of Normandy in 1204, the strategic location of the harbour led to the construction of the castle of Mont Orgueil to protect the island against the French, also serving as residence for Governors of Jersey until the late 16th century when Elizabeth Castle was constructed off Saint Helier.
Born at the fortress of Domfront in southern Normandy, Ralph received his early education in the military arts.
In strategic terms, Ivry was on the boundary of the duchy of Normandy, by an important crossroads on a roman Road, by the valley of the River Eure.