So basically, I'll go through some more details of the screenshots, and give my ideas as to what culture is portrayed, for the less historically inclined.
Screenshots 1, 2, & 5 are definitely a Mamluk, Ayyubid, or other muslim middle-eastern culture, probably Sarranids.
Screenshots 3 & 4 are rather unique and hard to place. It's a dry, mountainous region, which suggests Turkish. However, the townspeople and equipment of the player character suggest a separate culture, possibly Byzantine, Georgian/Armenian, or Syrian. Who knows, it may just be a Sarran village.
Shots 6 & 9 seem to be Northern European, probably Nords. Equipment and architecture, as well as environment suggest this to me.
Shot #7 is very clearly central asian(Kirgiz, Kazakh, Mongol). Very Altaic. So therefore, Khergit.
8 & 11 are very obviously Western European. The Crossbow, the Kettle helmet, the Mailed horse, and the architecture of #8 are very Swadian.
11 seems like it could be either Nordic or Swadian, because of the longbow and similarity of some buildings to shot 6.
Finally, Shots 10 and 12 are
so Byzantine/Roman. If the architecture weren't enough, the equipment of the player in 10 is very obviously Byzantine, with the placement of the straps, and the leather rerebraces.