The Duchess of Normandy was the wife of the Duke of Normandy.
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Gunnor or Gunnora was Duchess of Normandy by marriage to Richard I of Normandy, having previously been his long-time mistress. She functioned as regent of Normandy during the absence of her spouse, as well as the adviser to him and later to his successor, their son Richard II.
Gunnor confirming a charter of the abbey of the Mount-Saint-Michel, 12th century (from archive of the abbey). Here she attested using her title of countess.