Question on Geass-verse history

[mjp.livejournal.com]

OK, I have a rough idea for a fanfic that I'm tossing around in my head. However, there's a critical point that I need to ask about, because otherwise I'll have to do some research on the Roman Empire. But I digress.

The question: was there a French Revolution or French monarchy in the Geass universe? I'm assuming that continental Europe progressed normally with Britannia's development going independent, and that France was Gaul and probably just populated by Gallic/Germanic tribes before the Roman Empire came around.

Any input or knowledge is appreciated!