Everyone starts with this address and people of ANY RANK can properly be styled in this manner. All peerages come with a Patent of Arms and are equal in rank. Royal peerages generally come with a Patent of Arms and have varying levels of precedence. Viscounties have the lowest precedence of the Royal Peerages. Counties have a greater precedence than Viscounties.
Duchies have greater precedence than Counties.
No set titles. The Tanist and Tanista have the lowest precedence of the royalty. The Prince and Princess have greater precedence than the Tanist and Tanista. The heirs to the Throne, the next King and Queen. The Crown Prince and Crown Princess have greater precedence than a Prince and Princess.