Faction unlocking - which are unlockable, and what must I do to unlock them?

[Soulflame]

so in short does Carthage become available when you complete the 1st game as Rome? Thats the faction that i really want to play.....

Yes, well, not the prologue I think, but the first Imperial Campaign (wether short or normal) will unlock the Carthage.

Inuyasha12:
If you play the Senate, the game will crash if you look at the senate offices list or the senate tab in the information screen. And you can't complete the game since you can't kill yourself .