Page "Louis the Pious" Paragraph 3

Louis was crowned King of Aquitaine as a child in 781 and sent there with regents and a court.

Charlemagne constituted the sub-kingdom in order to secure the border of his kingdom after the destructive war against the Aquitanians and Basques under Waifer ( capitulated c. 768 ) and later Hunald II, which culminated in the disastrous Battle of Roncesvalles ( 778 ).

Charlemagne wanted his son Louis to grow up in the area where he was to reign.

However, in 785, wary of the customs his son may have been taking in Aquitaine, Charlemagne sent for him to Aquitaine and Louis presented himself at the Royal Council of Paderborn dressed up in Basque costumes along with other youths in the same garment, which may have made a good impression in Toulouse, since the Basques of Vasconia were a mainstay of the Aquitanian army.