Neustria

The territory of Neustria or Neustrasia, meaning "new [western] land", originated in 511, made up of the regions from Aquitaine to the English Channel, approximating most of the north of present-day France, with Paris and Soissons as its main cities. Thus Neustria formed the western part of the kingdom of the Franks under the rule of the Merovingian dynasty during the sixth to eighth centuries. The distinct area originated at the time of the death of Clovis I (reigned 482–511), when his sons divided his lands between them. It later became a term for the region between the  Seine and the Loire rivers known as the regnum Neustriae, a constituent subkingdom of the Carolingian Empire and then West Francia. The Carolingian kings also created a March of Neustria which was a frontier duchy against the Bretons and Vikings that lasted until the Capetian monarchy in the late tenth century.
See more at Wikipedia.org...