Is there "such a thing" at all
Isen't it princess/Prince of Habsburg - Wittelsbach a.s.o.??
Or maybe Österreich, Bayern a.s.o.
Wasen't the emperor choosen "??
According to the Golden Bull of 1356, the emporer was elected among the rulers of the different "contries. And seen from that point of veiw no one could be princess/prins of the Holy Roman Empire!! I haven't been able to find it exactly but in my opinion it must be so!!