Another succession law question: In my game the duke of Apulia created the duchies of Benevento and Calabria and somehow acquired seniority succession (in some order). All three duchies had seniority, I checked. I invited a guy with strong claims on all of them, gave him a barony, and pressed his claim on Calabria (shame there isn't a "press all claims" CB when it's for someone else). I was worried that he would have seniority succession when he became duke and the duchy would just be inherited by the duke of Apulia/etc. again, but when the war ended he had agnatic gavelkind, I'm guessing because the game copied the succession law he had as a baron. So that was fine. The duke of Apulia was killed during the war, and I took a look at his successor and realized that my claimant was his heir according to seniority! So I thought I could just assassinate him after the war and my new duke would peacefully inherit the other two duchies and then I would ask him to change his laws to gavelkind. I checked, after the war the succession law of the other two duchies was seniority. But a few months later they had switched to gavelkind for some reason. There was no revolt, and the guy couldn't have changed succession laws because he had only been duke for like a few months. Did my war somehow change his succession law?