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Terrain is definitely per barony, but not so sure on the other two. I really hope everything is per barony as that will be able to represent something like Danelaw much better than per county religiion/culture
 
Control, development, popular opinion, Culture and faith seems to be on the county level.
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It would be even more accurate to rely upon the barony/church/town unit as representative of populations of cultures, religions, and of the geographic terrains, rather than just whole counties accounting for all excepting possibly just terrains at the same time. For example, the Dalmatia region of Croatia could have the Slavic Croatian culture for most regions by a certain point (1066 AD?), and some Dalmatian cultural holdouts mostly focused around the city holdings or baronies along the coast and the islands. This dynamic would have an important impact on Venetian history, as well, all the way through its entire lifespan as a sovereign, Most Serene Republic.
 
I too think it would've been better to have culture and religion determined on a per barony basis. But I would in fact want to go even a step further and would argue in favor of a percentile representation of both culture and religion. So instead of a county/barony simply being Catholic it could be 74% Catholic, 23% some flavor of pagan, and 3% Jewish.
 
It would've been nice to have it per barony as well, given we can actually see them on the map. While this obviously wouldn't be able to really show some of the more culturally or religiously diverse parts of the map to the fullest extent, having it per barony would have been a good step in that direction. I hope this will be changed in the future.
 
74% Catholic, 23% some flavor of pagan, and 3% Jewish.

Hmm, I could see that working for a northern Germanic province, circa the 9th century, or even the 11th century. I think of northern Germany around the Saxon and Pomeranian lands, Denmark, or parts of Sweden or Norway. 3% Jewish might be high for Scandinavia, but I could see that in some parts of Germany, in combination with the fairly high Pagan populations. If we go back to Emperor Charlemagne times, I could see early 8th century northern Rhineland regions, bordering the Saxons, having such demographics, or a part of Bavaria or Austria. Anyway, your post just had me speculating as to where in Europe might there be around 74% Catholics, 23% Pagans, and 3% Jews, that's all. The Pagan reference definitely has me thinking of Central and Northern Europe provinces bordering non-Catholic realms.
 
I just made the numbers up on the fly to illustrate a point, it's not an actual reference to any point in history, but if we were looking for something to fit, maybe it could apply to some place in Poland.