Quote Originally Posted by Qurinus
Ah. Yes. I've noticed that too-- highly annoying at times. Other than the tale of the gold-chevroned peasants of Noricum that I like to repeat so much, I also had Dumatha revolt to Parthia once, playing as the Egyptians. I've noticed that if this happens, the faction it revolts to goes to war with you. Does that happen with everyone? It was quite annoying, because I was going to suggest an alliance against the Seleucids with Parthia when they went to war with me over some grimy desert town.
Yep - whenever a city rebels to any faction war is declared between the two parties. This includes the rebels if they have sent one of their diplomats to negotiate a ceasefire/alliance.

I've had a similar thing happen to me before. I was the Greek Cities, in a loving relationship with the Gauls. We shared a few borders across Europe, but the AI was maintaining the alliance, possibly helped by the regular tribute of 1,000 denarii per turn which I had granted them for as long as we both survived (it was limited to 9,999,999 turns, but that's pretty much the same thing).

Anyhow, the Brutii, who had a few provinces in Western Greece, owned Patavium and I chose to conquer it from them. I occupied it and the city instantaneously began rioting against me. Since it had not been upgraded by the Romans it was still a Barbarian Large Town.

When it finally revolted against me, and my troops were kicked out, it went to Gaul. All of our friendly peace treaties were marked void and their forces began rapid swarming into my lands. Although I eventually managed to defeat them, it took a lot of resources and man power. Especially since I was also fighting the Scythians at the time.

Not good anyhow