Carloman I in the context of Bertrada of Laon

Charlemagne (/ˈʃɑːrləmeɪn/ SHAR-lə-mayn; 2 April 748 – 28 January 814) was King of the Franks from 768, King of the Lombards from 774, and Emperor of what is now known as the Carolingian Empire from 800. He united most of Western and Central Europe and was the first recognised emperor to rule from the west after the fall of the Western Roman Empire approximately three centuries earlier. Charlemagne's reign was marked by political and social changes that had lasting influence on Europe throughout the Middle Ages.

A member of the Frankish Carolingian dynasty, Charlemagne was the eldest son of Pepin the Short and Bertrada of Laon. With his brother Carloman I, he became king of the Franks in 768 following Pepin's death and became the sole ruler three years later. Charlemagne continued his father's policy of protecting the papacy and became its chief defender, removing the Lombards from power in northern Italy in 774. His reign saw a period of expansion that led to the conquests of Bavaria, Saxony, and northern Spain, as well as other campaigns that led Charlemagne to extend his rule over a large part of Europe. Charlemagne spread Christianity to his new conquests (often by force), as seen at the Massacre of Verden against the Saxons. He also sent envoys and initiated diplomatic contact with Harun al-Rashid, the Abbasid caliph in the 790s, due to their mutual interest in Iberian affairs.

Pope Adrian I (Latin: Hadrianus I; 700 – 25 December 795) was the bishop of Rome and ruler of the Papal States from 1 February 772 until his death on 25 December 795. Descended from a family of the military aristocracy of Rome known as domini de via Lata, he was the son of Theodore, who died when Hadrian was still very young; he was welcomed by his paternal uncle Theodotus (or Theodatus) consul, dux et primicerius Sanctae Romanae Ecclesiae.

Adrian and his predecessors had to contend with periodic attempts by the Lombards to expand their holdings in Italy at the expense of the papacy. Not receiving any support from Constantinople, the popes looked for help to the Franks. Adrian's tenure saw the culmination of on-going territorial disputes between Charlemagne and his brother Carloman I. The Lombard king Desiderius supported the claims of Carloman's sons to their late father's land, and requested Pope Adrian crown Carloman's sons "Kings of the Franks". When the Pope failed to do so, Desiderius invaded Papal territory and seized the Duchy of the Pentapolis. Charlemagne besieged Pavia and took the Lombard crown for himself. He then restored the Pentapolis to the Papacy as well as some of the captured Lombard territory.

In the history of the Papacy, the Frankish Papacy (756–857) was a period marked by a shifting of influence from the Byzantine Empire (i.e. the Byzantine Papacy) to that of the kings of the Franks. Pepin the Short (ruled 751–768), Charlemagne (r. 768–814) (co-ruler with his brother Carloman I until 771), and Louis the Pious (r. 814–840) had considerable influence in the selection and administration of popes. The "Donation of Pepin" (756) ratified a new period of papal rule in central Italy, which became known as the Papal States.

This shift was initiated by the Lombards conquering the Exarchate of Ravenna from the Byzantines, strengthened by the Frankish triumph over the Lombards, and ended by the fragmentation of the Frankish Kingdom into West Francia, Middle Francia, and East Francia. Lothair I continued to rule Middle Francia which included much of the Italian peninsula, from 843 to 855.

Gisela (757, Aachen, Cologne, North Rhine-Westphalia, Germany – 810–11, Chelles, Seine-et-Marne, Île-de-France, France) was a Frankish princess and abbess. There are also two variations of her name, which are Gisele and Giselle. She was the daughter of Pepin the Short and his wife Bertrada of Laon. She was the sister of Charlemagne and Carloman.