The one that is technically a principality
... Principalities were usually 
not technically independent, for example the electors of the Holy Roman Empire 
were... [DOC] [TLE] BBC - Future - 'I rule my own ocean micronation' [PAR] Apr 15, 2015 ... Michael, the son of Roy Bates, is the Prince of the Principality of Sealand, ... one 
of four naval sea forts designed by Guy Maunsell for the British ... Sealand, sitting 
six miles offshore, was suddenly, technically, on British land.