Robert the Magnificent (1000 – 1035), also called the Devil or Robert I, Duke of Normandy, son of Richard II, Duke of Normandy
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Robert Curthose or Robert II (c. 1051 or 1054–1134), Duke of Normandy, son of William the Conqueror, the first Norman king of England
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Rollo, occasionally known as Rollo the Viking, (c. 860 - c. 932), founder and first ruler of Normandy
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