If there is unrest in a city is showed by the fork-symbol, you can see this in any case simply by using toggle_fow. So if you can't see any fork symbol in Roman cities, there is no unrest in this round.
If you want to see further informations, follow this:

Press F1
Press the question-mark in the right upper corner
The advisor will pop up, press "show-me-how"
dismiss the advisor with clicking on th "X", not the portrait

You will now have the perfect_spy command enabled, which will give you many informations about enemy cities and armies

XSamatan