Shogun42

I would also like to see the defeat of a sovereign have a political effect. Perhaps a simple toggle "If you destroy an enemy sovereign, then the surviving heir immediately proposes a cease-fire". You don't have to accept, but it could be an excellent way to end a war with a decapitation strike, if only temporarily. It would prevent wars from continuing interminably as you repeatedly kill sovereign after sovereign.

Another interesting possibility would be to occasionally split the faction amongst the "of age" children, resulting in several smaller factions. Or have some cities potentially defect to nearby factions, or even become "barbarian" cities.