Pepin I of Aquitaine

Pepin I or Pepin I of Aquitaine (French: Pépin; 797 – 13 December 838) was King of Aquitaine and Duke of Maine.

Pepin was the second son of Emperor Louis the Pious and his first wife, Ermengarde of Hesbaye. When his father assigned to each of his sons a kingdom (within the Empire) in August 817, he received Aquitaine, which had been Louis's own subkingdom during his father Charlemagne's reign. Around this time, the only coinage issue bearing Pepin's name was struck, likely at Louis's behest.

Ermoldus Nigellus was his court poet and accompanied him on a campaign into Brittany in 824.

Around 827-8, Louis sent Pepin to support Bernard of Septimania against an incursion into the Iberian March, supported by the Umayyad ruler Abd al-Rahman. Pepin and his army failed to reach the March in time to make a difference, for which the co-leaders of his army, Hugh of Tours and Matfrid of Orléans were deposed.