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Actually, DeadDreams is partially right.
I remember playing with Chameleon about 4 years ago on the map "If these walls...". I was very unpleasantly surprised to discover at one point that on the day when my city's growth increased, I didn't have a capital – a minor thief sneaked along the edge and stole my city.
This isn't possible on all maps, but it can be done on some.