The conduct of viscounts Simon, Jean and Louis during the Hundred Years' War allowed the Rochechouart family to attain the highest reaches of the 15th-century French feudal hierarchy. Viscount Louis, who died in 1394, was involved in the campaigns that returned the French kings to the throne of France, and was called cousin by the king. The three viscounts who succeeded him — Jean II, Geoffroy and Foucaud — were councillors and chamberlain to Charles VI, Charles VII and Louis XI. By their marriages, they expanded their territories, receiving the fiefdoms of Berry and Poitou. Jean II married Eléonore de Mathefelon, whose mother was of the "sang royal". Within the king's armies, the viscounts were "chevaliers bannerets", at the head of important troops of knights, horsemen and men at arms. Supporters of the crown of France during the civil war which marked the reign of Charles VI, they participated in the great battles of the Hundred Years' War during that century — Agincourt and the campaigns of Joan of Arc, to whom Geoffroi was a companion. Geoffroi's son Foucaud was named governor of La Rochelle and the Aunis region, a post of capital importance whilst the expulsion of the English continued in Guyenne. Made a knight of the Order of the Porcupine, a chivalric order of only 24 members instituted by Charles d'Orléans, he participated in 1453 at the capture of Bordeaux and the Battle of Castillon which marked the French monarchy's reconquest of south-western France and the definitive victory of France over England in the Hundred Years' War.