The term "Neustria" took on the meaning of "land between the Seine and Loire" when it was given as a regnum (kingdom) by Charlemagne to his eldest son, Charles the Younger, in 790. At that time, the chief city of the kingdom appears to have been Le Mans, where the royal court of Charles was established.
Ingelheim is a town in the Mainz-Bingen district in the Rhineland-Palatinate, on the west bank of the Rhine. From the 8th century the Ingelheim Imperial Palace was located there, and served emperors and kings as a lodging and a ruling seat.
Flandre is now the (political) community of the Flemings, and a geographical region located in parts of present-day Belgium, France, and the Netherlands. Over the course of history, the geographical territory that was called "Flanders" has varied.