I'm currently playing as the Bey of Beirut, a direct vassal of the Sultanate of Persia. I control all 4 provinces within the Emirate of Galilee as well as 1 other (Tripoli). I have more than enough money to usurp said Emirate. The title is currently controlled by an Emir within the Fatimid Sultanate, so we do not belong to the same realm, and both my realm and theirs are at peace. According to all this, I should be able to usurp the Emirate of Galilee shouldn't I? Because I can't. When I examine the tooltip, the only explanation I get is a red statement that I cannot usurp a title the same rank or higher than my liege. But as I said, my liege is a Sultan! Surely I can usurp an emirate? Any ideas?