I apologize to those of you who undoubtably already know this exploit.
lol

Also, be careful. The city does not always revolt back into your hands. Example: I was just playing as the greek cities, and one turn i noticed i now had a new city. It's up to the north of me and just north-east of the julii. It was owned by the macedonians (who i'm at war with).

It turns out that last turn, the brutii captured it, but it rebelled. The macedonians must have treated the people badly, so it rebelled into the best of the hellnistic factions (me), the greek cities. So be careful - wouldn't you hate it if rome (that you just captured as the julii) revolted into the brutii's hands. Ouch