Charlemagne was the elder son of Pippin the Short, king of the Franks, and Bertha, or Bertrada, daughter of Charibert, count of Laon.The place of his birth is unknown and its date uncertain, although some authorities give it as the 2nd of April 742; doubts have been cast upon his legitimacy, and it is just possible that the marriage of Pippin and Bertha took place subsequent to the birth of their elder son. When Pippin was crowned king of the Franks at St Denis on the 28th of July 754 by Pope Stephen II., Charles, and his brother Carloman were anointed by the pope as a sign of their kingly rank. The rough surroundings of the Frankish court were unfavourable to the acquisition of learning, and Charles grew up almost ignorant of letters, but hardy in body and skilled in the use of weapons.
In 761 he accompanied his father on a campaign in Aquitaine, and in 763 undertook the government of several counties. In 768 Pippin divided his dominions between his two sons, and on his death soon afterwards Charles became the ruler of the northern portion of the Frankish kingdom, and was crowned at Noyon on the 9th of October 768. Bad feeling had existed for some time between Charles and Carloman, and when Charles early in 769 was called upon to suppress a rising in Aquitaine, his brother refused to afford him any assistance. This rebellion, however, was easily crushed, its leader, the Aquitainian duke Hunold, was made prisoner, and his territory more closely attached to the Frankish kingdom. About this time Bertha, having effected a temporary reconciliation between her sons, overcame the repugnance with which Pope Stephen III. regarded an alliance between Frank and Lombard, and brought about a marriage between Charles and a daughter of Desiderius, king of the Lombards. Charles had previously contracted a union, probably of an irregular nature, with a Frankish lady named Himiltrude, who had borne him a son Pippin, the" Hunchback." The peace with the Lombards, in which the Bavarians as allies of Desiderius joined, was, however, soon broken. Charles thereupon repudiated his Lombard wife (Bertha or Desiderata) and married in 771 a princess of the Alamanni named Hildegarde. Carloman died in December 771, and Charles was at once recognized at Corbeny as sole king of the Franks. Carloman's widow Gerberga had fled to the protection of the Lombard king, who espoused her cause and requested the new pope, Adrian I., to recognize her two sons as the lawful Frankish kings. Adrian, between whom and the Lombards other causes of quarrel existed, refused to assent to this demand, and when Desiderius invaded the papal territories he appealed to the Frankish king for help. Charles. who was at the moment engaged in his first Saxon campaign, expostulated with Desiderius; but when such mild measures proved useless he led his forces across the Alps in 773. Gerberga and her children were delivered up and disappear from history; the siege of Pavia was undertaken; and at Easter 774 the king left the seat of war and visited Rome, where he was received with great respect.
During his stay in the city Charles renewed the donation which his father Pippin had made to the papacy in 754 or 756. This transaction has given rise to much discussion as to its trustworthiness and the extent of its operation. Our only authority, a passage in the Liber Pontificalis, describes the gift as including the whole of Italy and Corsica, except the lands north of the Po, Calabria and the city of Naples. The vast extent of this donation, which, moreover, included territories not owning Charles's authority, and the fact that the king did not execute, or apparently attempt to execute, its provisions, has caused many scholars to look upon the passage as a forgery; but the better opinion would appear to be that it is genuine, or at least has a genuine basis. Various explanations have been suggested. The area of the grant may have been enlarged by later interpolations; or it may have dealt with property rather than with sovereignty, and have only referred to estates claimed by the pope in the territories named; or it is possible that Charles may have actually intended to establish an extensive papal kingdom in Italy, but was released from his promise by Adrian when the pope saw no chance of its fulfilment. Another supposition is that the author of the Liber Pontificalis gives the papal interpretation of a grant that had been expressed by Pippin in ambiguous terms; and this view is supported by the history of the subsequent controversy between king and pope. Returning to the scene of hostilities, Charles witnessed the capitulation of Pavia in June 774, and the capture of Desiderius, who was sent into a monastery. He now took the title "king of the Lombards," to which he added the dignity of "Patrician of the Romans," which had been granted to his father. Adalgis, the son of Desiderius, who was residing at Constantinople, hoped the emperor Leo IV. would assist him in recovering his father's kingdom; but a coalition formed for this purpose was ineffectual, and a rising led by his ally Rothgaud, duke of Friuli, was easily crushed by Charles in 776. In 777 the king was visited at Paderborn by three Saracen chiefs who implored his aid against Abd-ar-Rahman, the caliph of Cordova, and promised some Spanish cities in return for help. Seizing this opportunity to extend his influence Charles marched into Spain in 778 and took Pampeluna, but meeting with some checks decided to return. As the Frankish forces were defiling through the passes of the Pyrenees they were attacked by the Wascones (probably Basques), and the rear-guard of the army was almost annihilated. It was useless to attempt to avenge this disaster, which occurred on the 15th of August 778, for the enemy disappeared as quickly as he came; the incident has passed from the domain of history into that of legend and romance, being associated by tradition with the pass of Roncesvalles. Among the slain was one Hruodland, or Roland, Margrave of the Breton march, whose death gave rise to the Chanson de Ro'and (see ROLAND, LEGEND OF).
