Again... I'll have to do some checkup in the start locations code...
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Playing as Eleanor trapped inside a Mountain range. I can imagine the following scenario:
« Sir Alexander, it seems that our cities near those Mountains are facing some Loyalty issue. »
« How is that possible? We are in the Medieval Age, Spies are not yet a thing... »
« I... don't know. But it seems that our Population is going crazy about an unknown foreign culture. »
« What? How come our people even know and appreciate something about a civilization that nobody heard about? »
« It's a mystery. But those people are literally going to betray us and join that civilization anyway... »
Meanwhile:
« Lady Eleanor, it seems a city from a foreign empire wants to join us! »
« Wait... there are people other than us in the world? »
At least you can get out of that one...once you get mountain tunnels.
Which is way too late, sadly. I guess it is possible to put an Encampment outside in order to spawn military units and expand through conquest. At least the capital is completely immune to be conquered in the early game! The domination victory can even be made impossible to achieve to all other civilizations if you control all the mountains as you cannot put Tunnel in foreign territory. It also needs to neither receive any Embassy nor share city location to the AI in order to prevent a GDR to jump over, while preventing the world to launch a Satellite... but planes are still a threat.