Hellfire
Prince
Early on, if you have a situation where you have a nasty war going on between another civ, taking and razing one of their cities is actually a pretty good buffer, surprisingly. If it would take an AI too far to get to you, I've found they give up. Without a lot of roads and no cities near yours it takes a very long time to get anywhere in the ancient era. Cities provide way points which are most useful for advancing, scouting, and defense against getting yourself flanked by your enemy.