|Medieval depiction of the battle.|
Charlemagne's son Louis the Pious had ruled the inherited empire of his father seemingly well enough, but as he was getting on in age he decided to dole out his territories to his sons in keeping up with Frankish law rather than the eldest one getting the whole shebang. But, in keeping with many Medieval cultures (and ancient ones' too) Louis gave his sons co-ruler status while he was still alive.
|Louis the German|
|Charles the Bald|