Definition of royal duke in English:

royal duke

noun

  • A duke who is also a royal prince.

    • ‘He set about purging the officer corps of royalist and Bonapartist elements and took advantage of the law of June 1886 exiling the heads of France's ruling families to dismiss half a dozen royal dukes and counts from their posts in the army.’
    • ‘The royal dukes of York, Gloucester and Cumberland all brought their patronage to Southampton where the aristocracy came to take the waters and the streets became the fashionable place to be seen.’
    • ‘We now have five royal dukes - Cornwall & Rothesay, Gloucester, Kent, Edinburgh and York, and one potential royal duke, Prince Harry.’