Just got this. Never played Crusader Kings, so it's a lot getting used to. For now, I'm playing as the Duke of Munster. Already had my Vassal declare War on me. Apparently he didn't like me throwing him off my Council, but I figured having a Spymaster that disliked me, no matter how little, would be asking for trouble. My forces were superior though, so now I regained my lands and got rid of this troublesome vassal right away