Current Kings and Queens are addressed "Your Majesty" and so are some former Kings - King Juan Carlos of Spain, King Simeon of Bulgary and King Constantine of the Hellenes (Greece). The Grandduke of Luxembourg is a "Royal Highness". The Crown Princes of Serbia and Montenegro are styled "Your Royal Highness". That goes for members of other former Kingdoms as well. The Sovereign Princes of Monaco and Liechtenstein are addressed "Your Serene Highness". The claimant to the defunct Russian throne would be addressed "Your Imperial Highness". I believe that the claimant to the Austrian and Hungarian thrones are addressed "Your Imperial and Royal Highness". And the Pope is addressed "Your Holiness".
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