Peace resolution : law change?
I don't know if this has been mentioned but I think it would be cool if you could force an enemy to maintain or change his succession law. Say you married your son to the only daughter of a neighbor and you wanted to ensure that your eldest grandson inherits even if said neighbor were to have a son at a later date by forcing him to maintain female succession.
I like the idea, but even if with inheritance allowed through the female line or by women (the former was much more common than the latter) wouldn't his son have a better claim? This doesn't mean that it is a bad idea; it should be possible to force him to make him accept his grandson (from the female line) instead of his son. Kind of like the treaty between Stephen of Blois and 'empress' Matilda, which made Henry d'Anjou, the son of Matilda, the heir of Stephen instead of Stephen's own sons.
However this will probably not always apply for all titles, for instance they may lose the kingdom with the royal demesne*, but are allowed to keep an ancestral duchy and/or county(/counties).
* = I hope that a distinction will be made between royal and personal/dynastic demesne, the latter may become part of the royal demesne after a dynasty goes extinct.
You answered your own question with the example of Henry I This would be explained that you would force the nobles of said realm to swear fealty to your grandson regardless of succession laws. These laws were, by the way, rarely set in stone and immutable. Maybe you'd have events firing afterwards that would make life harder for your grandson. but that's the fun of the game.
Originally Posted by Ruwaard