Read meneth's guide. It's sticked at the top of the forum. The short answer is that the character's "type" doesn't match the holding, and there's pretty much nothing you can do to change a character's type, short of revoking his title.If a vassal has a -30 for "Wrong Holding Type" does that mean that he has the wrong kind of holding or that I do? If it's him, is there anything I can do about that?
Certain cultures have access to different buildings that have different effects. The English get super-archers. Italians get more pikemen, etc.What are the cultural specific buildings?