Treaty of Amiens (1423)

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The Treaty of Amiens, signed on 13 April 1423, was a defensive agreement between Burgundy, Brittany, and England during the Hundred Years' War. The English were represented by John, Duke of Bedford, the English regent of France, the Burgundians by Duke Philip the Good himself, and the Bretons by Arthur de Richemont, on behalf of his brother the Duke of Brittany. By the agreement, all three parties acknowledged Henry VI of England as King of France, and agreed to aid each other against the Valois claimant, Charles VII.^[1] It also stipulated the marriage of Bedford and Richemont to Burgundy's sisters, in order to cement the alliance.

The Treaty of Amiens was formed in the aftermath of the Treaty of Troyes. It helped maintain the Anglo-Burgundian alliance until 1435, and the basis of the dual-monarchy of the two kingdoms of England and France first formed by King Henry V of England at Troyes.