The Armagnac party was a party of French politics that existed from 1407 to 1435 in the aftermath of the assassination of Duke Louis I of Orleans. His successor Charles d'Orleans led the Armagnac party in a civil war against Duke John the Fearless of Burgundy's Burgundian party, and the party took its name from Charles' uncle Bernard VII of Armagnac, who led some of the seasoned troops from Gascony that fought for Charles against the Burgundians. The 1419 assassination of John the Fearless led to the Duchy of Burgundy siding with England during the Hundred Years' War, and the war would not end until both sides made peace in 1435, with King Charles VII of France outlawing both parties and forcing them to end their rivalries to unite France against England.