Spoken as if I'm not already planning on adding building-based countries for every single bishop in the world.At this point we might as well admit that the game badly lacks internal politics mechanics since there are many countries that have powerful nobility like this. It's very distressing how in order to have internal politics in the game it needs to be painstakingly hacked in with building-based tags, for each country separately. However given that this probably won't happen your suggestion is as good as any. Someone should make a mod that tries to implement this generically for more countries though.
What's another building-based country for every noble house? Though it makes me think that the "hereditary administrative division" idea that I had could just be replaced with noble families as building-based countries.
I'd also certainly not call it "painstakingly hacked". Building-based countries seem perfectly reasonable for a noble family representation.
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