Ryal Highness (abbreviated HRH for His Royal Highness or Her Royal Highness) is a style used tae address or refer tae some members of royal families, usually princes or princesses. Monarchs and their consorts are usually styled Majesty. When used as a direct form of address, spoken or written, it takes the form "Your Ryal Highness". When used as a third-person reference, it is gender-specific (His Ryal Highness or Her Royal Highness, both abbreviated HRH) an, in plural, Their Ryal Highnesses (TRH).
By the 17th century, all local rulers in Italy adopted the style Highness, that was once used by kings and emperors anly. According tae Denis Diderot's Encyclopédie, the style of Royal Highness was created on the insistence of Archduke Ferdinand o Austrick, Cardinal-Infante o Spain, a younger son o Keeng Philip III o Spain. The Archduke was travelling through Italy on his way tae the Low Countries an, upon meeting Victor Amadeus I, Duke o Savoy, refused to address him as Highness unless the Duke addressed him as Ryal Highness. Thus, the first use o the style Ryal Highness wis recorded in 1633. Gaston, Duke o Orléans, younger son o Keeng Henry IV o Fraunce, encountered the style in Brussels an assumed it himself. His children later used the style, considering it their prerogative as grandson or daughter o Fraunce.
- His Ryal Highness The Duke o Lorraine.
- Her Ryal Highness Maria Antonia Princess Imperial an Airchduchess o Austrick, Prince Ryal o Hungary an Bohemie, Princess o Tuscany.
- His Ryal Highness The Infante Don Felipe o Spain.
- Her Ryal Highness The Princess o Wales.
- His Ryal Highness The Duke o Cambridge
- His Ryal Highness The Grand Prince o Tuscany