Are you sure you want to leave Maximus? You've been in far worse positions before, and if you decide to return to the game with a new faction it'll be even harder getting established. I'm warning you against regretting leaving the game, it may even be best just to accept Rogue General's peace terms. You're on the back foot here against two factions so if you want Rome to survive you'll have to be willing to accept a peace that isn't favourable.
Ahem - sorry about the formatting. I was on Evernote just before and for whatever reason it decided to curse me with formatting issues on everything.
Sonofbooyah - last game I did exactly as Noblewoman is doing, that's how I came second even after joining several turns after the start of the game. It's a good tactic, thought a little boring.