If you are France, for example, and conquer Jerusalem. Then you rename it to Salem and give it to the Pope who loses it to Mongols. Then after you have 50 provinces and return and retake Salem (Jerusalem) from the Mongols will you get a win message. Would you have to rename it back to Jerusalem to get the win? In other words are the city name changes linked to all references if you just modify it in the one location? This has some potential for messing with the AI, because if you rename a city which a particular AI always goes for such as the Mongols for Kiev or Antioch what will it do? Will it go to a secondary one? If the Russians rename Kiev "Sarkel" and rename Sarkel "Kiev" will the Mongols go to Sarkel for their Home? This could be fun if you could rename Paris "Kiev" and Dijon "Antioch".