Riddermark said:You will never find Duchy/Principality of Varna too
As far as I know Varna and Karvuna(Kavarna) are the same thing.
As for Tarnovo/Turnovo I would prefer to spell it like I just did. Trnovo is fine with me but I am afraid some other non-slavic and especially romance-germanic speaking people will have some tongue-breaking.