alternatehistory.com

Your challenge, should you choose to accept it, is to have the French kings get the title Holy Roman Emperor and, most importantly, keep it. I guess one could start with Charles the Bald who was the king of West Francia (which roughly corresponds with France), but after that this branch of the Carolingians and successor dynasties should keep the title of Holy Roman Emperor instead of it reverting to the German kings.

Give it a go. Feel free to discuss the ensuing alternative development of Germany and France (I imagine the French rulers campaigning a lot in Italy rather than the Germans).
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