Pease treaty bug.

[Hammarn]

Well, why should they give in to the demand? Even if its just 1g, if they are strong enough to give you some trouble they i guess they wont even give you 1g. You may even get a negative modificator for your relations, which would be even worse for your war plans.

But then what if you gave him 1g, whould't that work??

 

[Commander Bello]

I haven't tried declaring war yet in BtS, but I can report a similar peace treaty bug. Every now and then in 3.02 I see a bogus message "Peace treaty with [another civ] has been cancelled" when I have never had a war with them. It happens about every 50 or so turns with a randomly selected competitor and doesn't appear to affect anything. But maybe it's related.

This might happen due to a vote of the Apostolic Palace. If the resident had issued a vote (decided positively by the majority) to end a certain war, all members of the AP are bound to this.
The effect is they all have a peace treaty for 10 turns now, even if they have not been at war before.

 

[Scotsh]

But then what if you gave him 1g, whould't that work??

Gift != Demand
Gifting something will not result in a 10 turn peace treaty.