A '''Duke''' is a the title of a male [[Monarchy|monarch]]. The only present [[Europe]]an Duchy is the Grand Duchy of [[Luxembourg]]. Its Grand Duke is [[Henry I]].
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'''Duke''' is the title of the male ruler of a duchy or of a male member of the nobility. Traditionally, duke is the highest level of nobility, ranking just below the [[Monarchy|monarch]].
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The only current [[Europe]]an Duchy is the Grand Duchy of [[Luxembourg]]. Its current Grand Duke is Henri.
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Non-royal dukes exist some of the present-day European monarchies, including the [[United Kingdom]] and [[Spain]]. In other European monarchies, including [[Belgium]] and [[Sweden]], the title of duke is given to members of the royal family (e.g., the heir to the Belgian throne is titled Duke of Brabant).