I am playing as the Duke of Bohemia. My liege is the Kaiser. My vassals have 2 of the 3 counties of the (de jure) Duchy of Moravia.
I was planning to create the title Duke of Moravia, but the Kaiser (my liege) created the title for himself first.
It looks like I can usurp the Duke of Moravia title once I have enough money. Is that true? Also, could the Kaiser usurp the title back from me?
EDIT: Upon closer examination, I discovered that my brother (who held the 3rd county of de jure Moravia) had the Duke title. (I assume he was given the title by his liege the Kaiser, although I don't remember seeing a notification.) I was able to usurp the Duke of Moravia title from my brother.