after reading some posts about how some civilizations should be added into the game, I had this idea about automatic leader succession which will introduce variety into the game. We know that civilizations change in time due to cultural exhange and scientific advance. I thought it would be interesting if leaders of civilizations change if certain scientific advances are discovered (or maybe certain civics triggered). For example, France led by Jean D'arc until the discovery of divine right, then replaced by Louis until the discovery of rifling when napoleon takes over. Persians led by cyrus until the industrial age, and in the industrial age, if persians switch to theoracy, khomaine (sorry if mispelled) takes over. Also the name of the civilizations can change. (persia to iran in this case) Or Rome to Holy Roman empire(with theology) to italy (with nationhood). In my opinion different leaders with different traits will introduce unexpectedness into the game and increase the gameplay experience.