Everkane
Valar Morghulis
Wasn't it Civ II that had the empire-wide flips? I seem to recall losing entirely one-half of my empire in a game.
I'm not quite sure since it has about 10 years since my last Civ 2 game, but IIRC in Civ 2 if the capital of a empire is taken it's risky it'd split in two, so you would lose about a half of your cities.