Nice map, really well done! As for the starting date, what would be the benefit of starting in 800 AD over starting in 843 AD? In the first turns (I would change the timeline by the way to whole years per turn, it's less confusing) the Frank AI wouldn't be able to do much and gets split after 843 anyway. It's a matter of taste but I wouldn't start with too many cities preplaced, that's why 843 with France, Burgundy and Germany starting right away would be a preferable option in my view, all flipping a few cities.