The Duke of Gascony is a historical title associated with the region of Gascony in southwestern France. This title was often held by noble families during the medieval period, particularly by the English monarchy. The Duke's role included governance over the territory and representation of the king's interests in the region. The title gained prominence during the Hundred Years' War, when it was linked to the English crown's claims in France. Notable figures, such as Edward, the Black Prince, held the title, which symbolized both power and territorial control in the ongoing conflict between England and France.