Pikkis
Prince
The Peace Probability shows the probability that the leader will NOT start planning for war each turn, when they are Furious/Annoyed/Cautious/Pleased. Any leader with 0 as the first one means that if they are ever Furious with you, they WILL declare war sooner or later. Leaders will not plan to go to war with you at Friendly, ever, but if they start the plan before they get to Friendly, they won't stop it.
To further elaborate, each turn the AI will run a algorithm that decides whether it wants to declare war on you (or anyone else for that matter). That algorithm does not take into consideration diplomacy levels, but does take into account the aggression rating. If the algorithm comes back with a decision to prepare for war, the game then looks to the diplomacy levels to possibly override the decision. Those numbers are the % chance that the decision will be overridden for each diplomacy level. For example, at Furious, a DoW decision will never be overridden, at friendly it always will.
These didn't answer my question. If I wasn't clear enough, I was trying to ask why, for example, Mao has Medium aggression while he declares war with higher probability than Ragnar, who has High aggression level. I asked that, because it doesn't make any sense for me. What's the point of the aggression level anyway, when there are pre-set peace probabilities?
ggganz: I understood that first number means "annoyed", not "furious".