King of Aquitaine in the context of "Borrell of Ausona"

Louis the Pious (Latin: Hludowicus Pius; French: Louis le Pieux; German: Ludwig der Fromme; 778 – 20 June 840), also called the Fair and the Debonaire, was King of the Franks and co-emperor with his father, Charlemagne, from 813. He was also King of Aquitaine from 781. As the only surviving son of Charlemagne and Hildegard, he became the sole ruler of the Franks after his father's death in 814, a position that he held until his death except from November 833 to March 834, when he was deposed.

During his reign in Aquitaine, Louis was charged with the defence of the empire's southwestern frontier. He conquered Barcelona from the Emirate of Córdoba in 801 and asserted Frankish authority over Pamplona and the Basques south of the Pyrenees in 812. As emperor, he included his adult sons, Lothair, Pepin and Louis, in the government and sought to establish a suitable division of the realm among them. The first decade of his reign was characterised by several tragedies and embarrassments, notably the brutal treatment of his nephew Bernard of Italy for which Louis atoned in a public act of self-debasement.

The Catalan counties (Catalan: Comtats Catalans, IPA: [kumˈtats kətəˈlans]) were those surviving counties of the Hispanic March and the southernmost part of the March of Gothia that were later united to form the Principality of Catalonia.

In 778, Charlemagne led the first military Frankish expedition into Hispania to create a military buffer zone between the Frankish Empire and the Emirate of Córdoba, occasionally known as the "Hispanic March". The territory that he subdued would in later centuries become the kernel of Catalonia (not yet known like that since the first written mention of Catalonia is in 1113). In 781, Charlemagne made his 3-year-old son Louis the Pious (778 – 840) king of Aquitaine, who was sent there with regents and a court in order to secure the southern border of his kingdom against the Arabs and Moors and to expand southwards into Muslim territory.

Pepin II, called the Younger (823 – after 864 in Senlis), was King of Aquitaine from 838 as the successor upon the death of his father, Pepin I. Pepin II was eldest son of Pepin I and Ingeltrude, daughter of Theodobert, count of Madrie. He was a grandson of the Emperor Louis the Pious.

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.

Ebbo, Ebo or Epo (c. 775 – 20 March 851) was the Archbishop of Rheims from 816 until 835 and again from 840 to 841. He was born a German serf on the royal demesne of Charlemagne. He was educated at his court and became the librarian and councillor of Louis the Pious, king of Aquitaine, son of Charlemagne. When Louis became emperor, he appointed Ebbo to the see of Rheims, then vacant after the death of Wulfaire.

He was an important figure in the spread of Christianity in the north of Europe. At the insistence of Louis, in 822, he went to Rome and asked Pope Pascal I to become the papal legate to the North. He was licensed to preach to the Danes and he and Halitgar, bishop of Cambrai, and Willerich, bishop of Bremen, went there in 823. He made short subsequent trips, but all with little success. Ansgar was more successful a few years later.