Hello BlueRobin

Im not sure you can see an enemy spy in your own city. Even with spy and assassins of your own. Please someone correct me ...I dont use assassins often.

I recall Corduba was mine as Carthage. It had unrest problems. Over end of turn an enemy Gaul spy was caught and killed. That prompted me to look closer at the unrest in the city. Looking at it and thinking about spies led me to believe there was at least another 4 eyes of spy in there. I added another spy of my own..making two spies of mine.
Next turn another Gaul spy was caught and killed. Unrest had dropped. The point is my spies had not revelaed the enemy spy to me on the city display...but I believe they were helping on counterspying activity over the end of turn.