I've also noticed that, depending on the specifics of the game setup, one civ can be rather sadistic and keep coming back for more ... one reason for this can be all the asian art style civs other than the Mongols are already taken. Then, if the rebel Mongols never manage to take a city, they aren't considered a legitimate player and can be respawned over and over ... but should they ever take a city, they will never again come back randomly. Only if cities they have some culture in rebel will they rise from the ashes. When a rebel civ is spawned, it is given all but a handful of the most expensive techs known by the motherland ... since the Mongols were getting respawned, they were getting new techs. This seemed much more reasonable to me than having civs respawn with only the techs they knew at the time of death ... thoughts? This is a bug. Essentially, while the new civ has its slate wiped clean, the other teams do not forget the past transgressions of the player in a slot, even when the player changes ... this will be fixed in the next version. Are you thinking a popup or just an interface message? Right now, (believe it's in the version posted here) an interface message is shown if you can see the city where the rebellion is taking place ... perhaps switching to a have you met the civ that's suffering the rebellion would be more appropriate.