Nalgasucia507
Squire
No matter what you do (policies, influence, relations) a successful kingdom ends up this way.
Too many vassals doing too well for themselves and they always have enough influence to run you out and gets multiple wars going.
You can't do anything useful with them. You can get them more fiefs but you also have to defend them all too and now you can't upgrade or stock them
There's really no point in creating a kingdom over just being a powerful single clan, except just to do it because you can.
I guess you could call them all to an army and hold them until enemies take all their fiefs away, then maybe they'll leave
That's where a space should be made for rulers to bring them down, with consequences of course.