Started as a count in Byzantium. I am now a doux, and would like to expand. I got a cas bel on my neighbor doux, but when I try to invade the one criteria I do not have is it says the doux must be independant. Does this mean you cannot expand within the Byzantine empire militarily? If so is it like this with all realms? What about the HRE? I would prefer a little more flexibility and not have to completely rely on luck and blood lines to expand within my own empire.