Royalty of the past and of the present. The dynasties and the value they gave to their countries, or principalities or duchies or whatever.
There is still Royalty in Transylvania, although it is in the King of Romania now.
Long ago though Transylvania had its own Prince. Not surprisingly the leader was called "Prince of Transylvania. The person was the leader of the government of the area.
After the formation of the Dual Monarchy of Austria and Hungary, the Prince of Transylvania was also the King of Hungary and Emperor of Austria.
The last person to lay claim to Prince of Transylvania was Emperor Karl of Austria, King of Hungary, and Prince of Transylvania.
His son Otto von Hapsburg is the current pretender to this claim.