Duchy of Normandy
Territory
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The Duchy of Normandy grew out of the 911 Treaty of Saint-Clair-sur-Epte between King Charles III of West Francia and the Viking leader Rollo. The duchy was named for its inhabitants, the Normans. Wikipedia
Capital: Rouen
Founded: 911 AD
Status: Vassal state of West Francia (911-987); Vassal state of the Kingdom of France (987-1259)
Historical era: Middle Ages