The Duchy of Gascony or Duchy of Vasconia was a duchy located in present-day southwestern France and northeastern Spain, an area encompassing the modern region of Gascony. The Duchy of Gascony, then known as Wasconia, was originally a Frankish march formed to hold sway over the Basques. 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.

The history of Toulouse, in Occitania, southern France, traces back to ancient times. After Roman rule, the city was ruled by the Visigoths and Merovingian and Carolingian Franks. Capital of the County of Toulouse during the Middle Ages, today it is the capital of the Midi-Pyrénées region.