
Originally Posted by
Ludens
It's true that type I and II governments generally give you the most options in the long term, but the Romans are unique in that they cannot build factional barracks outside of type I provinces until the Polybian reform, and not outside of Italy until the Marian reform. Because of this regional barracks are more important, and type III and IV governments allow higher levels of the regional barracks. Furthermore, certain provinces offer good high-level regional units that make it worth keeping them as a type III/IV. For the Romans, the prime example would be the Brihentin cavalry (check the recruitment viewer: IIRC it's available in a couple of Celtic provinces).
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