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His Royal Highness Prince William of Wales, Duke of Cambridge
and
Her Royal Highness Catherine, Duchess of Cambridge
HRH Prince William of Wales
Duke of Cambridge
Earl of Strathearn
Baron of Carrickfergus
He goes by:
William, Duke of Cambridge
or
Prince William
The Duke of Cambridge, however, whereas Catherine is the Duchess of Cambridge, rather than a Princess, William retains his rank as Prince. He is therefore Prince William, Duke of Cambridge.
yes and Prince William is the duke of cambridge