just decided to try out a .80 game and the Yor were my neighbors. they declared war on me about 2 turns after we meet, even though they were about 60 hex distance and not close - and it was early game so their ships moved 2 hexes. I built a few defensive ships and just continued doing eco etc. the Yor never showed up and the war was certainly a fake one. I really have no idea why he declared in the fist place.
So, I ask for peace after about 40 turns and Yor sure was happy to give me all their techs (about 10 of them), all their gold and about 1/3 of their fleet to have peace with me. Geez, thanks Yor, please declare war again soon. Anyway, I think others have mentioned the AI's crazy war declarations but I wanted to mention their crazy peace offer too - it's bound to be some sort of bug as I was not a threat at all and nowhere near his territory.