Season 32: "I, Carumbus"
Fantastic! I loved it. Simpsons in Ancient Rome, some history concerning Rome and a moral lesson of how much ambition you should pursue. Great. I also could see some parallels with Trump in the episode. One of the best recent episodes. I'm glad it wasn't 3 different tales of Rome, but one big story. The violence was strangely refreshing and a exploration in tone and boundaries. Almost akin to the violence in a Rick and Morty episode.
It was technically also a "future" version of the Simpsons (despite taking place in history), since Bart and Lisa get older in the story.