The
Duchy of Gascony (also
Vasconia; ; ) was a duchy in present southwestern France, roughly corresponding to the modern region of
Gascony after 824. The Duchy of Gascony, then known as
Wasconia, was originally a
Frankish march formed to hold sway over the Basques (Vascones). However, the Duchy went through different periods, from its early years with its distinctively Basque element to the merger in personal union with the
Duchy of Aquitaine to the later period as a dependency of the
Plantagenet kings of England.