Royal Highness

Royal Highness is a style used to address or refer to some members of royal families. It is also used by some sovereigns, such as reigning grand dukes today of which there is just Luxembourg.

When used as a direct form of address, spoken or written, it takes the form Your Royal Highness. When used as a third-person reference, it is gender-specific (His Royal Highness or Her Royal Highness, both abbreviated HRH) and, in plural, Their Royal Highnesses (TRH).