During his stay in the city Charles renewed the donation which his father Pippin had made to the papacy in 754 or 756.
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.
Charles Martel, however, a son of Pippin by a concubine Chalpaida, seized the mayoralty in both kingdoms, and he it was who continued the Carolingian dynasty.
The Frankish assemblies, previously held in the month of March (champs de mars), but under Pippin deferred to May (champs de mai), came to be more numerous, and served the king of the Franks as a means of receiving the gifts of his subjects and of promulgating his capitularies.
Such mayors .(dowere Aega and Erchinoald, in Neustria, Pippin and Otto in Austrasia, and Flaochat in Burgundy.
According to Berte aus grans pies, in the 13th-century remaniement of the Brabantine trouvere Adenes le Rois, Charlemagne was the son of Pippin and of Berte, the daughter of Flore and Blanchefleur, king and queen of Hungary.
For many years the Saxons had been troublesome to the Franks, their neighbours to the east and south, and the intermittent campaigns undertaken against them by Charles Martel and Pippin the Short had scarcely impaired their independence.
This donation of Pippin in 756 confirmed the papal see in the protectorate of the Italic party, and conferred upon it sovereign rights.
The division that Louis the Pious made at Aix in 817 among his three sons, Lothair, Pippin and Louis, was of like character, since he reserved the supreme authority for himself, only associating Lothair, the eldest, with him in the government of the empire.
All attempts to induce Pippin to throw over his new protege failed, and from this time onward the nominal dependence of Rome and the papacy on emperors at Constantinople ceased.