Historical region, southern France.
It corresponds approximately to the modern département of Ariège in the région of Midi-Pyrénées. Foix was a quasi-independent power from the 11th to the 15th century. Bounded by Languedoc and by the territories of the counts of Roussillon and the kings of Aragon , it became part of the crown lands at the ascension of Henry IV as king of France (1589).