After viewing a couple different sources, I noticed that most of them stated that the Bithynians were an Thracian people. In game it is portrayed as a typical Iranian faction so I just set out to correct Vanilla's mistake. In this mod I have made a couple of changes to the Bithynian faction that I think can make their portrayal more historically accurate.
Not save game compatible. (Bithynia won't be able to have a home city or port due to changes if using existing save) This will even mess up current campaigns only if the player is Bithynia because of the building chain changes. AI Bithynia will be effected aswell but this mod won't crash or corrupt your save, or anything like that.
Changes Made
Starting units changed from Eastern to Thracian
Starting buildings changed from Eastern to their Barbarian equivalents
Faction Culture changed from Hellenic to Daco-Thracian
Region culture for Nicomedia changed from Hellenic to Daco-Thracian
Faction group changed from Eastern to Daco-Thracian
Building and Technology availability changed to Barbarian
General units changed from Eastern units to Thracian units
Eastern Garrison changed to Thracian garrison.
Bithynian military group changed from Eastern to Thracian.
Bithynia U.I. changed from Eastern to Barbarian
Custom Battle Units to Thracian
Requires All Factions Playable for DEI official submod loaded after.
Side Note: Not too sure how to change the General Variants so if some could help that would be great. You of course would get credit and I'll add it to the mod.