The Khedive of Egypt is styled "Your Highness," or "His Highness;" The children of kings and queens, "Your Royal Highness," or "His Royal Highness;" The children of emperors, "Your Imperial Highness," or "His Imperial Highness " Till the reign of Henry VIII the kings of England were styled "Your Highness," "Your Grace," "Your Excellent Grace," etc , or "His" etc
the condition of being high or lofty (Your Highness or His Highness of Her Highness) title used to address a royal person
A title of honor given to kings, princes, or other persons of rank; as, His Royal Highness