yeah I forward settled right on Darius' capital (Emperor) this game to get Lake Victoria and a huge resource of iron and he was peeved at me but never attacked, now he will trade luxuries on equal turns so I guess it's all forgotten.
But if you want a warmonger game I suggest you download the smart AI mod and play a continents/fractal/pangaea with the Huns, Aztecs, Zulu, Mongols, Ottomons, Assyria, Rome, Germany, Songhai, China.
It's quite funny to observe. On continents or Fractal you have no idea what's going on on the other continent but some games you will see the "An unmet player has lost their Capitol" message and then in another 20 turns "An unmet player has lost their Capitol" - that has me thinking I'm glad I'm not over there on that side of the world.... all hell must be breaking loose
The Huns are funny, they just build a huge army of horse archers and battering rams and go on a huge blitz destroying every city in their path (except Capitols). They can be quite useful to have nearby as they just raze all your neighbours cities and open up huge areas of land, just watch they don't turn to you.
And when I did explore that continent wow, nearly every Citystate was occupied (you can tell by the coloured flag on the city label) and 2 Civs were completely swallowed up and by the end of that game the Zulu's had taken the entire continent by themselves (they swallowed the Mongold who had annexed all of Assyria & they also did the same to the Ottomons who had swallowed the Aztecs. Quite funny to watch. All that was on the smart AI mod btw.
The Smart AI mod can be deadly if the AIs have big armies. They move and shoot so the AI submarines will absolutely wreck havoc on your navy if they get dominance. I learnt that the hard way, esp when that Civ has Expoloration so their subs can see like 4 tiles in every direction.