Royal dukedoms in the United Kingdom

In the British peerage, a royal duke is a duke who is a member of the British Royal Family, entitled to the style of His Royal Highness. Royal dukedoms are the highest titles in the British roll of peerage. They are titles created for legitimate sons and male line grandsons of the British monarch, usually upon reaching their majority or marriage. The titles can be inherited but cease to be "royal" once they pass beyond the grandsons of a monarch. As with any peerage, once the title becomes extinct, it may subsequently be recreated by the reigning monarch at any time.