budgetmonk's new byzantium video shows an exploit in it. The knights want a chunk of the anatolian coast including inland provinces. If you set the coastal ones as desired by yourself, the knights will still join on the promise of land, but will be happy with nothing as they can't possibly core the land they want which you don't want. I guess this will be a bit tricky to fix.If there is nothing they in the end when evaluating for the peace that they want, they are supposed to be cool with it, fixing a previous issue where you could give them nothing and they would get upset. If there's a way to cheese it please report it in the bug report forum.