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A duchy is a territory or domain ruled by a duke or duchess. Historically, some duchies in Continental Europe were sovereign, while others (especially in France and Britain) were subordinate districts of a kingdom.
Traditionally, a grand duchy, such as Luxembourg, was generally independent and sovereign. Sovereign duchies were common in the Holy Roman Empire and German-speaking areas. In France, a number of duchies existed in the medieval period. Queen Elizabeth II of the United Kingdom still holds the medieval French title of Duke of Normandy; the only lands still attached to the Duchy of Normandy are the Channel Islands.