You know I tried starting my own kingdom too early and got slaughtered instantly. So I gave up the kingdom and went back to a clan. Ages after I noticed sturgians had declared war on the none existing kingdom I had left behind. I realised at that point the kingdom warfare was absolutely random. Your own vassals conspire to burn through you “ influence” by “ considering war” when your already in a big war. There is no doubt in my mind the game just thinks ‘ he’s doing too well here, let’s conspire
It’s if a kingdom declares war on you whilst your in a castle/ town. It’s a joke.