So I was just in a Victoria game where I was just going for a casual tall build for a Diplomacy win. My neighbors were Amanator and Alexander. Well after Alex got about 4 cities out, Ama just beat the Hell out of him and took him out of the game. So things are progressing along but Ama didn't quite keep up her good sense and dropped to a Dark and then a Normal age causing my tall cities' pressure to cause all 4 of the former Macedonian cities to fall to me including the capital. I didn't care at first because I had so many ameneties but then too late I realized that when the capital fell, I would not be able to release it back to Alex since I didn't technically conquer it. So suddenly I'm left with the holding a foreign capital diplomatic penalty. Outside of perpetually holding a Cultural Alliance (I don't even think we had Alliances when the capital was falling) or straight going to war with Ama, could i have done anything else to prevent this?