For the record for future on the Slavic factions:
o The names of the Slavic generals may sound "slavic" for the outsiders, but I'm pretty sure the majority of them were just invented for fun by a Pole (they really sound Polish, so they're not invented by a Czech or a Russian or a Croat). They’re just jokes in Polish, sounding medieval-like.
o The number of Christians in Branibor, Gniezno and Kruszwica is way too high. I think it should be 5% at best - now it's 80%. Christianity will come here in 200 years, and only after 500 years such numbers would be historical.
o According to Einhard (iirc) the main settlement of Vendland’s king Drogowit was Branibor, not Demmin (and it was besiedged by Charlemagne in 789). To my mind there should be a state of war between Vendland and the Franks at the beginning. Besides, if you’re using the Slavic names (it’s Branibor, not Brandenburg), it should be Dymin, not Demmin.