So, basically, assume that not only is the Frankish baggage train massacred and looted at the Battle of Roncevaux Pass in 778 AD, but that the commander of the Franks, King Charles I (never to be known by his epithet ITTL), dies at the hands of the Basques in the ambush. The Song of Roland ends up even more tragic, if it’s still written.
What would be of the Frankish Empire after this? Who would assume the regency for the newborn, orphaned Louis the Pious? How would the Frankish relationship with the Saxons, Lombards, Andalusian Muslims, etc., be changed by this development?
 
Bumping. If Louis also dies as a child, who gets the throne then?

Louis doesn't figure much, as he had three elder brothers living. And iirc Charlemagne's brother Carloman had left two sons, who iirc were living in Italy.

If Pepin the Hunchback is considered ineligible, the Kingdom is probably split between the other three. Charles probably gets the lion's share.
 
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