Honestly, not sure if this is a bug or if it is intended behaviour. I'm Canada. I've had alliances with China, Ottomans, England, Indonesia for most of the game. Somewhat at odds with the Dutch. Indonesia starts winning via religion. I'm the last civ she has to convert, so I ask her not to. She agrees, and promptly breaks that promise. I denounce, and 5 turns later declare a holy war so I can start condemning heretics. Emergency declared. I expect that Indonesia and the Dutch will vote for it. Imagine my surprise when they both vote against it, but the English and Ottomans both vote for it, outstripping my counter votes. Suddenly, I'm at war with two of my allies. Or at least, people who were my allies a moment ago. Throughout the course of the war, I kill a few Ottoman units, but I really don't want to hurt them. I like them. So I keep trying to make peace. They're asking for outrageous concessions, like 130 gpt despite my not being harmed by them in any way (I hadn't even lost a unit to that point). Neither of them actually peaced out until 60 turns later when I'd taken 3 of the Ottomans cities (razed one), and returned them in the deal. England made peace slightly later, after joining another emergency when I took the Indonesian holy city.