Frankish Mayor of the Palace (680–714) who reunited the Frankish realms under his rule and made his family the true power behind the Merovingian throne.
Pepin of Herstal was the Mayor of the Palace of the Franks from 680 to 714, and the man who made his family the true rulers of the Frankish kingdoms. In an age when the Merovingian kings had dwindled into powerless figureheads — the "do-nothing kings" — real authority lay with the mayors of the palace, and Pepin, head of the powerful Austrasian house descended from Arnulf of Metz and Pepin of Landen, seized that power for good.
By his victory over the rival Neustrians at the Battle of Tertry in 687, Pepin united the mayoralties of all the Frankish realms under himself, ruling as effective sovereign while a shadow Merovingian sat on the throne. He was the grandfather of Charlemagne's grandfather — the founder of the dynasty's greatness — and the father of Charles Martel.
Pepin was born about 645 into the greatest noble family of Austrasia, the eastern Frankish realm, the grandson of Pepin of Landen and of Bishop Arnulf of Metz, whose descendants would become the Carolingians. He inherited vast estates and a claim to the hereditary office of mayor of the palace, the chief minister who commanded the army and ran the government in the king's name.
As the Merovingian kings sank into impotence, the mayors became the real rulers, and Pepin set out to make himself master of all the Franks.
Pepin of Herstal emerges from the sources as a shrewd, tenacious, and ruthless dynast — a great territorial magnate who understood that power in the Frankish world now flowed from land, arms, and the control of the mayoralty rather than from the fading royal title. Patient and calculating, he spent decades building his family's dominance and eliminating rivals.
He was also the founder of a dynastic project that his descendants would carry to its culmination. By making the mayoralty hereditary in his house, subduing the outlying peoples, and cultivating the Church — supporting missionaries like Willibrord among the Frisians — he laid the political and religious foundations on which his son Charles Martel, his grandson Pepin the Short, and his great-great-grandson Charlemagne would build. He appears as the hard, far-seeing architect of Carolingian greatness.
Pepin's decisive achievement came in 687, when he led the Austrasians against the Neustrians — the western Franks — and defeated them at the Battle of Tertry. The victory made him mayor of the palace over Neustria and Burgundy as well as Austrasia, uniting the whole Frankish world under his authority. Thereafter he ruled as effective sovereign, styling himself "duke and prince of the Franks", while a powerless Merovingian reigned in name.
He spent the following decades campaigning to hold and extend Frankish power — against the Frisians, Alemanni, and others — and worked closely with the Church, supporting the mission to convert the pagan peoples on his frontiers.
Pepin died on 16 December 714. His attempt to pass his power to his young grandsons under the regency of his widow Plectrude collapsed into a violent succession struggle, from which his illegitimate son Charles — the future Charles Martel — emerged, after imprisonment and war, as the new master of the Franks.
Pepin of Herstal is remembered as the founder of the effective rule of the Carolingian house. By uniting the Frankish mayoralties and making his family's power hereditary and unchallengeable, he set the stage for his descendants' rise from mayors to kings to emperors. The Frankish hegemony he established would, within three generations, give Western Europe its first emperor since antiquity in his descendant Charlemagne.