Duchy of Aquitaine Agincourt in 1415. He succeeded in obtaining the French crown for his family by the Treaty of Troyes in 1420. Henry V died in 1422, when his son Henry VI inherited the French throne at the age of less than a year; his reign saw the gradual loss of English control of France. The Valois kings of France, claiming supremacy over Aquitaine, granted the title of duke to their heirs, the Dauphins, during 1345 and 1415: John II (1345–50), Charles VII (1392?–1401), and Louis (1401–15). French victory was complete with the Battle of Castillon of 1453. England and France nominally
English claims to the French throne Edward III, the nephew of the deceased king and thus the nearest adult male relative, based his claim on the theory that a woman could transmit a right of inheritance to her son. This claim was rejected by French jurists however, under the principle "Nemo plus juris ad alium transfere potest quam ipse habet" (no one can transfer a greater right to another than he himself has), and the throne was given to the male line heir, Philip, Count of Valois, a first cousin of the deceased king. At the time, Edward paid homage to Philip VI for his Duchy