Neustria. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/neustria
The western part of the kingdom of the Merovingian Franks from the sixth to the eighth century, in present-day northwest France. It engaged in almost constant warfare with Austrasia, the eastern portion of the realm. After 912 the name was applied to Normandy.
On the other hand, mayors like Flaochat (in Burgundy) and Erkinoald (in Neustria) stirred up the great nobles, who claimed the right to take part in their nomination, against the king.
It must be observed that from 639 there were generally separate mayors of Neustria, Austrasia and Burgundy, even when Austrasia and Burgundy formed a single kingdom; the mayor was a sign of the independence of the region.
Each mayor, however, sought to supplant the others; the Pippins and Charles Martel succeeded, and their victory was at the same time the victory of Austrasia over Neustria and Burgundy.
In 718 he appears as the ally of Chilperic II., king of Neustria, who was fighting against the Austrasian mayor of the palace, Charles Martel; but after the defeat of Chilperic at Soissons in 719 he probably made peace with Charles by surrendering to him the Neustrian king and his treasures.
There a certain Adalbert or Aldebert, a Frankish bishop of Neustria, had caused great disturbance.