If it is 'unrest' it is probably a spy (some times there is a spy from way back when you first took the town or before, that will just keep going into the town even if it isn't important to his people anymore). Though, sometimes a really bad governor can be causing that. Besides that, there are just some cases that a city has unexplained unrest. I had one game where Taras had 15% unrest for a hundred years.
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