I'm tempted to dispute whether the Carolignian Empire was too big per se. If you put the capital at Lyon (or Geneva), everything is fully reachable in a month o

I'm tempted to dispute whether the Carolignian Empire was too big per se. If you put the capital at Lyon (or Geneva), everything is fully reachable in a month on this graph. The problem, rather, was that Lyon was never made the capital (rather Metz in the far north), or at least not in time to prevent fragmentation.