I find it weird that conquered provinces have nationalism. I mean, what peasant cares about who he is paying taxes to? In fifteen century subjugations were common, that's how polish commonwealth formed. Lithuanian's nobles were ''culture and religion converted'' to fit poland more and they didn't make much objections. Nobles didn't object. Educated people. Why the hell would guy who's whole life consist of feeding and eating chickens had any problems with new liege?