A game about "post-campaign" domain-level play

In fantasy literature, and some fantasy games, stories often end with the heroes defeating the big bad and, with earned fame and experience, splitting apart to take positions of power. Aragorn becomes king of Gondor, Gimli rebuilds Erebor, Pippin even becomes Thain of the Shire. In certain D&D editions, fighters establish castles, wizards build towers, rogues head thieves guilds. It's a fairly natural endpoint for rich, powerful heroes.

I've been daydreaming for some time about a game that follows and interrogates this epilogue, asking how these new kings and archmages interact with eachother. What happens when the fighter-king's subjects want to cut forests protected by the archdruid? What does the paladin's order have to say about the crimes of the thieves' guild? IMO this is pretty fun grounds for a character based game with some elements of player character conflict and politicking.

I know a few games that deal with some of these dynamics - Apocalypse World, Legacy: Life Among the Ruins, maybe Godbound - but I'm curious to hear what others there are. Are there any interesting games dealing with this premise, or that could be hacked to support it? And more broadly - what are the best RPGs you've seen that deal with domain-level play or inter-PC conflict?