The predominance of the Pepin family had commenced before the time of Charles Martel, by their possessing the hereditary office of Mayor of the Palace. During the life of that great chieftain, there were several inter-reigns in Austrasia and Neustria, and he continued to exercise the supreme authority with the simple title of Duke of the Franks. At his death, his children, Pepin and Carloman, divided the kingdom between them, Pepin, still preserving some respect for appearances, made Childeric III. king in Neustria; and soon, by the abdication of his brother Carloman, he found himself Duke of Austrasia, as well as the all-powerful Mayor of the Palace in Neustria. Such was, however, the influence already possessed by the idea of the hereditary legitimacy of the crown, that Pepin did not venture to seize, in the name of force alone, upon the throne which was considered to belong rightfully to the descendants of Clovis. He sought to justify his employment of force by popular election, and an appeal to religion. As the head of an aristocracy, he was obliged frequently to defer to its will, and to give it a share of authority. He revived the ancient assemblies of the large landowners, and restored to them their part in public affairs. {93} Thenceforward he might consider himself certain of his election; but even this did not suffice him. He thought that his usurpation needed a more august and sacred sanction. He gained over to his interests Boniface, bishop of Mayence, and charged him to sound Pope Zachary, who, on his side, was hard pressed by the Lombards, and needed the assistance of the Frankish chieftain. When Pepin was sure of the pontiff's concurrence, he sent Burckhardt, bishop of Wurtzburg, and Fulrad, abbot of St. Denis, to propose to him this question, in the form of a case of conscience. "When there is a king in fact and a king by right, which is the true king?" The pope replied, that he who actually exercised the royal authority ought also to possess the royal title. In 752, Pepin convoked the national assembly at Soissons; he was there elected king, and afterwards consecrated by Bishop Boniface. In 754, Pope Stephen III. made a journey into France, and again consecrated Pepin with his two sons and his wife Bertrade. The pope ordered the Franks, on pain of excommunication, to take none as kings who did not belong to the family of Pepin, and the Franks swore an oath: _Ut nunquam de alterius lumbis regem in ævo præsumant eligere_.