Treaty of Troyes
Burgundian party leadership passed to Philip III, Duke of Burgundy. Duke Philip entered an alliance with England. Due to his influence and that of the queen, Isabeau, who had by now joined the Burgundian party, the mad king was induced to sign the Treaty of Troyes with England in 1420, by which Charles VI recognized Henry V of England as his heir, disinheriting his own son the Dauphin.