theres a lot of similar mods
sorry if you weren't talking to me
but i figured you were, considering there is a viking mod under development(which i am looking forward too btw)

i was thinking more of an age of mythology approach where rather than dividing all the faction into sub-factions ie:norse= norway, sweden, denmark etc, but norse, greeks, egyptians, albion, etc

like you could build a temple to one of the gods and once it got upgraded enough it would unlock a new "myth unit"