Highness

Highness, a title of honour given to princes, grand-dukes, and minor reigning potentates. The title 'Highness' and sometimes 'Kingly Highness' were both used in England for the sovereign until the reign of Henry VIII., when they were superseded by 'Majesty.' The children of emperors are usually addressed as 'Your Imperial Highness,' of kings as 'Your Royal Highness,' whilst members of princely families have the titles of 'Serene Highness' and 'Highness.'