Carolingian king of Aquitaine, the second son of the emperor Louis I the Pious.

Pippin was granted Aquitaine in July 814 and was recognized as king in 817, though it was clear that he was to remain subordinate to his elder brother, Lothar (Lothar I), the heir to the imperial title. It was Pippin who in 830 started the revolt of Louis I's elder three sons against their father, but in February 831 he became reconciled with Louis. Rebelling again in 832, he was then deposed from his kingship by Louis. He escaped from detention and took advantage of his support in Aquitaine, joining his brothers in renewed rebellion against Louis in 833. Tensions with his brothers led Pippin to repent in 834, and he helped to restore the emperor's authority. Aquitaine was then given back to him, with Anjou in addition.

councillor of the Merovingian king Chlotar II and mayor of the palace in Austrasia, whose lands lay in the part of the Frankish kingdom that forms part of present-day Belgium. The reference to Landen dates from the 13th century.

Through the marriage of his daughter Begga with Ansegisel, son of Arnulf (d. 641; bishop of Metz), Pippin was the founder of the Carolingian dynasty. Deprived of his mayoralty at the accession (629) of Dagobert I, he regained power in Austrasia after that king's death (January 639) but did not long survive to enjoy it.