During the reign of Louis's grandfather Charles VI (1380–1422), the Duchy of Burgundy was very much connected with the French throne, but because the central government lacked any real power, all the duchies of France tended to act independently. In its position of independence from the French throne, Burgundy had grown in size and power. By the reign of Louis's father Charles VII, Philip the Good was reigning as duke of Burgundy, and the duchy had expanded its borders to include all the territory in France from the North Sea in the north to the Jura Mountains in the south and from the Somme River in the west to the Moselle River in the east. During the Hundred Years War, the Burgundians allied themselves with England against the French crown.