Well Casse aren't in the game anymore, some german tribes must be in the game, hopefully they'll include another one, maybe it is possible with the new government system to implement a kind of "migration and settling" period first and then an expanding one...
For the Koinon: Sparta went through an "hellenisation" process with Areus that allowed him to gain popularity and financial backing, than consider the "reforms/revolution" with Agis and Kleomenes...
I'm one of those people who would rather have a Spartan, Achean or Aetolian faction ^^
Unfortunately I don't know much about arab history :s
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