[Raging Deadstar]

Originally posted by Suicide Junkie:
It is possible to achieve peace, but you have to get them to move to a friendly demeanor first, and there is a minimum time IIRC of a year or five.

What you need to do:
- Not fight battles. Fighting lowers their friendliness. Try buffer zones, mines and black holes instead
- Give 'em trinkets. If they're accepting anything at all, you could give them a few resources to help them see you're not all evil.
- Out of sight, out of mind. Don't let them see your ships over their colonies, and try to avoid contested systems. Buffer zones help in this regard.

I think it's in the AI's Anger.txt file that determines how long it will take the AI to be more pleasant to you. Unfortuantly I've never got an AI to ever accept a treaty after they declared war.