Wikipedia
Royal Highness ( abbreviation HRH) is a style used to address or refer to some members of royal families, usually princes other than monarchs and their female consorts (i.e., kings and queens). 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 (Her Royal Highness or His Royal Highness, both abbreviated HRH) and, in plural, Their Royal Highnesses (TRH).
Holders of the style Royal Highness generally rank below holders of the style Imperial Highness, but above those addressed as Grand Ducal Highness, Highness, Serene Highness and some other styles.
Royal Highness is the first full-length LP released by Orange County, CA, rappers Kottonmouth Kings. Rappers on this album are Saint Dog, D-Loc, and Daddy X. This album include guest appearances by Daddy X's other band, Humble Gods, along with Dog Boy from the band Too Rude. The album peaked at number 17 on Billboard's Top Heatseekers chart on 15 January 2000. The song "Bump" peaked at number 28 on the Hot Modern Rock Tracks chart. In a 2015 interview with Johnny Richter he stated that he was a member of the group but was not featured on it due to a personal issue with a member of the group at the time of the album's release date.
Usage examples of "royal highness".
He says, His Most Imperial Majesty, Ichindar, ninety-one times Emperor, Light of Heaven, and ruler of all the nations of Tsuranuanni, sends greetings to his brother monarch, His most Royal Highness, Prince Lyam, ruler of the lands known as the Kingdom.
I'll have to ask His Royal Highness to order me to, so you may as well come along with me and explain the whole thing all over again to Duke Richard.