Romen, the roman empire persists for hundreds of years without real communication. Roman administration on the ground is actually very thin. They don't care about how you live, your local customs, you keep those. Ah, that's fine. Just pay taxes. And here, i think the big advantage is that the greek and latin literary culture comes to uni elits,. The very wealthy, the educated, over the mediterranean are all reading virgil. It's an influential strata on the top of society but it's probably also taking cues from their regular people as well.