Thegan's Vita Hludowici Imperatoris names (in order) "Hlutharius, Pippinus, Hludowicus" as sons of Emperor Louis I and his wife Ermengardis. His father sent him to govern in Aquitaine in [Aug] 814. Under the Ordinatio Imperii promulgated by Emperor Louis in 817, Pepin received "Aequitaniam et Wasconiam et markam Tolosanam totam, et…comitatos quatuor…in Septimania Carcassensem, et in Burgundia Augustudunensem et Avalensem et Nivernensem", specifying that he was to be named king, and thereby became PEPIN I King of Aquitaine.
He joined his brothers in rebelling against their father in 830, but after his father was restored the following year he rebelled once more. His father deprived him of Aquitaine in Sep 832, granting it to Pepin's half-brother Charles. He joined his brothers' further rebellion in 833, but with his brother Louis restored their father in 834 after their brother Lothaire had seized sole power. His father restored Pepin in Aquitaine 15 Mar 834 at Quierzy-sur-Oise. "Pipinus…rex Aquitanorum" granted privileges to Saint-Julien de Brioude, for the souls of "uxorisque nostræ Ingeltrudis reginæ…Hermeingardæ quondam reginæ, genetricisque nostræ Thetberti ac Nebelongi comitis, patris et avi eiusdem Ingeltrudis et prolis" by charter dated 12 Mar 836. His territory was reduced, in 837 and in 839, in favour of his half-brother Charles.
The Annales Bertiniani record the death "838 Id Dec" of "Pippinus filius imperatoris". The Chronicle of Adémar de Chabannes records the death of "Pipinus rex Aquitanie filius imperatoris" and his burial "Pictavis apud Sanctam Radegundem". The Chronicle of Saint-Maxence records the burial of "Pipinus rex Aquitaniæ, filius Ludovici imperatoris" at "Sanctam Radegundem Pictavis". When he died, his territories reverted to the empire. 2
Research Notes: