The House of Foix was a noble family in medieval France, originating from the region of Foix in the Pyrenees. It played a significant role in the history of the region, particularly during the Albigensian Crusade and the Hundred Years' War. The family produced several notable leaders, including Count Gaston IV and Queen Eleanor of Aquitaine. The house was known for its strategic marriages and alliances, which helped expand its influence. In the 15th century, the House of Foix merged with the House of Navarre, further solidifying its power in southern France and beyond. The family's legacy continues to be studied in the context of French nobility.