I like the whole "Not Using Justinian" thing, since I'm all about those new faces. Hippodrome is a decent building choice, but since there's only one of them I'm not sure how much I support it. A more interesting effect might be a super dumbed down Coliseum / early zoo, with a much smaller culture and amenity boost to cities within 6 tiles. It's an interesting take on the Varangian Guard as well, I kind of like it. For a more complete idea of how I was thinking of making Byzantium under Basil II, you can click here. Yeah, admittedly I don't like that part, especially since Basil's empire, while it reclaimed a lot of territory, wasn't all that large in civ terms. This is a neat effect, I like the idea of districts getting adjacency from a unique improvement so the player can min-max the bonus more. I'm not sure if this execution of Polders is the best way to execute that idea (since you don't have a ton of freedom on where you can place them but few restrictions beyond that, which mitigates the min-maxing you can do with it). Interesting. I actually quite liked City State Venice in Civ5, I'd be glad to see a return to that idea. Did you have a leader in mind? With how Great People work, I'm not entirely sure if unique great people would function in Civ6, to be honest.