This might not be so common with other nations, but Rome was a nation that everyone wanted. For greed and power, or to 'save Rome'. How will rebellions actually play out, that is both realistic and horrifying for the player?
CA has identified one detail; military generals can rebel against Rome with their army. Will it work with other nations? Would be cool. Though, I wonder how it would work. Can we see a general's loyalty statistics from the campaign map? Or the loyalty the army has for that general? How can we improve it so we don't have an army of 50,000 soldiers marching to Rome?
And how about the little details? Maybe the people like a citizen of Rome, and he decides to go against it with senators and armies.
Whatcha think?