How to greet the prince in the Middle Ages

In the Middle Ages, greeting the prince was called Your Highness. The specific address rules in the Middle Ages were: the queen must address her majesty in any public place, and the queen can call my queen by her first name in public. Other royal families and ordinary courtiers call the king and queen Your Majesty at any time. Ordinary courtiers address all members of the royal family as Your Highnesses with the title of [Duke or Prince], and members of the royal family can call them by their first names in private. When members address each other in public, and the other party is male and has been awarded a title, the address format is domain name and title followed by+name+your highness. For example, the Queen of England always addresses her son as the Prince of Wales at ceremonies, and on some extremely solemn occasions, such as the anniversary of her accession to the throne, she addresses the Prince of Wales and His Royal Highness Charles.