The dual monarchy of England and France existed during the latter phase of the Hundred Years' War when Charles VII of France and Henry VI of England disputed the succession to the throne of France. It commenced on 21 October 1422 upon the death of King Charles VI of France, who had signed the Treaty of Troyes which gave the French crown to his son-in-law Henry V of England and Henry's heirs. It excluded King Charles's son, the Dauphin Charles, who by right of primogeniture was the heir to the Kingdom of France. Although the Treaty was ratified by the Estates-General of France, the act was a contravention of the French law of succession which decreed that the French crown could not be alienated. Henry VI, son of Henry V, became king of both England and France and was recognised only by the English and Burgundians until 1435 as King Henry II of France. He was crowned King of France on 16 December 1431 in Paris.
In practical terms, King Henry's claim to de jure sovereignty and legitimacy as king of France was only recognised in the English and allied-controlled territories of France which were under the domination of his French regency council, while the Dauphin ruled as King of France in part of the realm south of the river Loire.
