Quote Originally Posted by MarkShot View Post
Is it possible to add a faction to The Empire without taking every province by battling every army and laying siege to every settlement? Is there build path of buildings for a single province which will turn a faction into a client state? I have spoken to Saul Tyre (my expert on mods, but he doesn't really play The Romans). So, is this possible? (he believes it is) And if so, what are the mechanics?
Besides making that faction a protectorate via diplomacy, you mean? No, it isn't possible. If you want to take control of another faction's cities, you have to capture or bribe them.

Since this is a general modding question, I am going to move this thread to the R:TW modding fora so that other people might find this answer.