Now, in an attempt to bring the discussion and speculation flow back to Bannerlord, let's take a moment and see this picture here:
This architectural style looks strikingly Russian to me, yet we have never seen it any screenshots of the like. I'm inclined to believe that it could only be the Sturgians who bear that style, and I wonder what are the main characteristics of the faction in general.
It it were for me to take a quick glimpse on what was shown in the gameplay videos, we have only seen the Empire, Battania (quite a lot of attention for these guys, I've got to say) and Vlandia to a lesser extent, and then add some bits of the Aserai and Khuzait. As of now though, I haven't noticed much Sturgian content.