It's possible that the old ones or the elves had some Roman aesthetic back in the day. They generally fulfill the fantasy Roman empire's purpose of being a once great power that ruled everywhere that has fallen.
True, but the cutural cachet of the Romans as a continent-spanning power that most or all of the modern peoples and a shitload of their institutions can claim descent from is missing. There's been no Interpretatio Romana, no romanice loqui leaving a common root in all the languages of the continent, no common cultural ancestor that you can trace the titles of the Princes of Tilea, the Emperors of the Empire, and the Tzars of Kislev to. There's no post-Marian Legions to point to as an ur-example of the power of a professional military. All these cultural bones and touchstones of western European history just aren't there in the Old World.
I don't know a ton about the settings history, is the Reman Empire not even a decent Rome knockoff? That's hilarious.
I'd argue that it's a lot more Greek than Roman, and it may not have actually happened at all.