Archambault's eldest son, John ("ca." 1382–1436), who succeeded to his father's lands and titles in 1412, had married Jeanne in 1402, daughter of Charles III, king of Navarre. Having served the king of France in Guyenne and the king of Aragon in Sardinia, John became the royal representative in Languedoc, when the old quarrel between Foix and Armagnac broke out again. During the struggle between the Burgundian party and the Armagnacs, he intrigued with both, and consequently was distrusted by the "Dauphin", afterwards King Charles VII. Deserting the French cause, he then allied himself with Henry V of England. When Charles VII became king in 1423, he returned to his former allegiance and became the king's representative in Languedoc and Guyenne. He then assisted in suppressing the marauding bands which were devastating France, fought for Aragon against Castile, and aided his brother, the cardinal of Foix, to crush an insurgency in Aragon.