A new danger, however, threatened the unity of the Frankish kingdom, namely, the aspirations of the powerful nobles. In the earliest accounts which we have of the Germans there appear to have been certain families who enjoyed a recognized preëminence over their companions. In the course of the various conquests there was a chance for the skillful leader to raise himself in the favor of the king. It was only natural that those upon whom the king relied to control distant parts of the realm should become dangerously ambitious and independent. [Sidenote: The Mayors of the Palace.] [Sidenote: Foundation of the power of Charlemagne's family, the so-called Carolingians.] Among the positions held by the nobility none was reputed more honorable than those near the king's person. Of these offices the most influential was that of the Major Domus, or Mayor of the Palace, who was a species of prime minister. After Dagobert's death these mayors practically ruled in the place of the Merovingian monarchs, who became mere "do-nothing kings,"--_rois fainéants_, as the French call them. The Austrasian Mayor of the Palace, Pippin of Heristal, the great-grandfather of Charlemagne, succeeded in getting, in addition to Austrasia, both Neustria and Burgundy under his control. In this way he laid the foundation of his family's renown. Upon his death, in 714, his task of consolidating and defending the vast territories of the Franks devolved upon his more distinguished son, Charles Martel, i.e., the Hammer.[20] [Sidenote: Fusion of the barbarians and the Roman population.] 15. As one looks back over the German invasions it is natural to ask upon what terms the newcomers lived among the old inhabitants of the Empire, how far they adopted the customs of those among whom they settled, and how far they clung to their old habits? These questions cannot be answered very satisfactorily; so little is known of the confused period of which we have been speaking that it is impossible to follow closely the amalgamation of the two races. [Sidenote: The number of the barbarians.] Yet a few things are tolerably clear. In the first place, we must be on our guard against exaggerating the numbers in the various bodies of invaders. The writers of the time indicate that the West Goths, when they were first admitted to the Empire before the battle of Adrianople, amounted to four or five hundred thousand persons, including men, women, and children. This is the largest band reported, and it must have been greatly reduced before the West Goths, after long wanderings and many battles, finally settled in Spain and southern Gaul. The Burgundians, when they appear for the first time on the banks of the Rhine, are reported to have had eighty thousand warriors among them. When Clovis and his army were baptized the chronicler speaks of "over three thousand" soldiers who became Christians upon that occasion. This would seem to indicate that the Frankish king had no larger force at this time.