HRH is an acronym for His Royal Highness or Her Royal Highness. It appears in front of the names of members of a Royal Family other than the King or Queen. In the British monarchy the title of HRH is associated with the rank of prince or princess. This is especially important when a prince has another title such as Duke (or a princess the title of Duchess) by which he or she would usually be addressed. For instance HRH The Duke of Connaught and Strathearn was a prince and a member of the royal family while His Grace The Duke of Devonshire is a non-royal duke and not a member of the British royal family.
