I had a great rival in my current game, I stared as provence and eventually got italy, France and Armenia, my mother had a strong claim on the byz empire so when she passed I got a claim, the byz had a female emperor (MY NEMESIS) so I was able to press it. I beat her and took the throne, BUT she still had a 12 county demense and an additional 5 counts under her. My new goal immediately became that of breaking her power... However this former empress had other plans, since I couldnt revoke her duchies for 10 years she was able to form Taurica... THEN she really stunned me by pressing her husbands weak claim on hungry and installing him as the king of hungry(I wanted hungry to remain independent for RP purposes).
As I try to avoid murder sprees (which I think are lame) I commissioned just the one murder, that of their eldest (and only) son. This left 3 daughters and gavelkind succession. Next I invited and pressed the claim of some random hungarian JUST so my vassal couldnt inherit hungry. This entire time she was at -100 relations with me and I had my spymaster constantly on her trying to uncover plots so I could revoke Taurica and break her power base.
The funny part is I never caught her plotting and was never able to get her imprisoned... She eventually died and I was completely unable to break up Taurica, funnily enough her daughters have become good vassals, a little strong for my tastes but theyve never rebelled or even plotted against me.
THe highlight of this whole cold war I had with the former empress was where my dirty old lustful emperor (58) got the fling event with one of the old empresses daughters... Despite being the most powerful man in the world the closest I could come to getting back at this vassal was getting her daughter preggers
I loved this whole rivalry, especially since the AI actually denied me my ultimate goal
