Territories of the house of Valois-Burgundy during the reign of Charles the Bold
The dukes of Burgundy had succeeded, over a period of about 100 years, in establishing their rule as a strong force between the Holy Roman Empire and France. Their possessions included, besides their original territories of the Franche-Comté and the Duchy of Burgundy, the economically strong regions of Flanders and Brabant as well as Luxembourg.
The dukes of Burgundy generally pursued an aggressive expansionist politics, especially in Alsace and Lorraine, seeking to geographically unite their northern and southern possessions. Having already been in conflict with the French king (Burgundy had sided with the English in the Hundred Years' War), Charles' advances along the Rhine brought him in conflict with the Habsburgs and especially emperor Frederick III.