So I'm the king of Sweden; awesome. After a surprising amount of pain and effort I took over the Finnish pagans, with the entirety of the Finland and Karelia duchies under my paw. Now I'm stuck with a question: is there a benefit to proclaiming the kingdom of Finland, beyond the one-shot prestige boost? If I were to grant the title to a (hopefully) well-meaning member of my dynasty, would their AI-controlled scores be added to mine at the end of the game? All things being equal I'd rather not want to deal with more-and-more rebellious vassals who desire my de jure kingdom title, but I don't want to go to all that trouble without something to show for it.