When the Merovingians were indisputably nothing but sluggard kings, and when Ebroin, the last great mayor of the palace of Neustria, had been assassinated (in 681), and the army of the Neustrians destroyed at the battle of Testry (in 687), the ascendency in the heart of the whole of Frankish Gaul passed to the Franks of Austrasia, already bound by their geographical position to the defence of their nation in its new settlement. There had risen up among them a family, powerful from its vast domains, from its military and political services, and already also from the prestige belonging to the hereditary transmission of name and power. Its first chief known in history had been Pepin of Landen, called The Ancient, one of the foes of Queen Brunehaut, who was so hateful to the Austrasians, and afterwards one of the privy councillors and mayor of the palace of Austrasia, under Dagobert I. and his son Sigebert II. He died in 639, leaving to his family an influence already extensive. His son Grimoald succeeded him as mayor of the palace, ingloriously; but his grandson, by his daughter Bega, Pepin of Heristal, was for twenty-seven years not only virtually, as mayor of the palace, but ostensibly and with the title of duke, the real sovereign of Austrasia and all the Frankish dominion. He did not, however, take the name of king; and four descendants of Clovis, Thierry III., Clovis III., Childebert III., and Dagobert III. continued to bear that title in Neustria and Burgundy, under the preponderating influence of Pepin of Heristal. He did, during his long sway, three things of importance. He struggled without cessation to keep or bring back under the rule of the Franks the Germanic nations on the right bank of the Rhine,--Frisons, Saxons, Thuringians, Bavarians, and Allemannians; and thus to make the Frankish dominion a bulwark against the new flood of barbarians who were pressing one another westwards.