The Treaty of Troyes was an agreement that Charles VI of France would, after his death, be succeeded by Henry V of England.

Signed in 1420, it disinherited the legitimate heir to the French throne and proclaimed Henry V the successor to the French king, Charles VI. It was designed to end the Hundred Years War which began in 1337. By the time it was signed, Henry V of England had undergone a successful campaign to take control of Northern France (1415-1419), and had concluded an alliance with the Burgundians who controlled Paris. Charles VI, who many believed had gone mad, agreed to have his daughter Catherine of Valois marry Henry V, insuring Henry V's legitimacy to the thrown of France. The agreement was eventually ratified by the Estates-General of France later in the year after Henry V entered Paris. Worse, for France at least, the queen, Isabeau of Bavaria, claimed that her son, Charles, was actually the result of an affair, and thus could not be the legitimate heir of Charles VI. When Henry and Charles died within months of one another in 1422, the infant son of Henry V, Henry VI, was proclaimed, in Paris, to be king of both France and England. Henry VI of England ruled Northern France through a regent, while Charles VI's son, Charles VII, reigned only in Southern France from his stronghold in Chinon. Eventually, the treaty failed when Joan of Arc began her mission to crown Charles VII of France, and begin drive the English finally out of the kingdom. Even after Charles VII succeeded in reconquering France, the English would continue to claim rightful ownership of the French crown for centuries..