Oh yes, almost forgot!

On vassals:

Your vassal is, as previously stated, an NPC of considerable power. Each of your vassals represents about 20% of your military power (leaving you in complete control of 60%) and can be ordered to assault or defend positions. Depending on your stance with the vassal, they will carry out or ignore the order. Vassals may also act independently if left without instructions or if ordered to do so. Keeping a good relationship with your vassals is important as they might become a threat to you if mismanaged. Your chosen Traits and Flaws obviously interact with your relation.