[Discuss] Can a Duke remove a region lord from his Duchy?

[Thomas Dalton]

> Then what mechanism does a Duke have to resolve a grievance with a landed
> vassal? He has oaths with good marks and bad ones for his regular knights; a
> landed noble has an obligation just as a knight does, and if he isn't
> fulfilling it, what is to be done?

Take the matter to the judge. If a lord isn't supplying the service of
enough knights (which is the obligation a lord has to his duke), it's
basically breach of contract and should be dealt with by the judge.