The Armagnac party was prominant in French politics and warfare during the Hundred Years' War. They were allied with the supporters of Charles, Duke of Orléans against John of Burgundy after Charles' father Louis, Duke of Orléans was killed at the orders of the Duke of Burgundy in 1407. The party took its name from Charles' father-in-law, Bernard VII, Count of Armagnac, who provided much of the financing and some of the seasoned Gascon troops that beseiged Paris before their defeat at St. Cloud. Later, John of Burgundy was sent back to his lands, and Bernard of Armagnac remained in Paris and, some say, in the Queen's bed. A map of Europe in the 1430s, at the height of the Hundred Years War The Hundred Years War was a 116-year-long armed conflict between the Kingdom of England and France, beginning in 1337 and ending in 1453. ... John I of Valois (May 28, 1371 in Dijon – killed September 10, 1419 on the bridge of Montereau), also known as the Fearless was duke of Burgundy from 1404 to 1419. ... Events November 20 - A solemn truce between John, Duke of Burgundy and Louis of Valois, Duke of Orléans is agreed under the auspicies of John, Duke of Berry. ... Bernard VII, Count of Armagnac (1360 – June 12, 1418) was count of Armagnac, count of Charolais and constable of France. ... The Gascon language is an Occitan dialect mostly spoken in Gascony (in the French départements of Pyrénées-Atlantiques, Hautes-Pyrénées, Landes, Gers, Gironde, a part of Lot-et-Garonne, a part of Haute-Garonne, and a part of Ariège), and in the small Spanish... Saint Cloud or St. ...

Charles married Bonne of Armagnac, who was only 11 at the time, partly for her dowry and the support of her father. The whole enterprise was shaky, and the term Armagnac became a derogatory term meaning rowdy or ruffian because the Gascon soldiers could only be maintained by allowing them to forage and pillage wherever they went.

• For the article on the region of France, see Armagnac (region).
• For the article on the brandy, see Armagnac (drink).