A slight rise is recorded to 8% at Agincourt, perhaps because this was a royal army, but thereafter the figure continued to decline and by 1443, the Duke of Somerset mustered only 1.3% knights among his men-at-arms.
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Somerset died in the Hospital of St Katharine's by the Tower.
When his eldest brother, Henry Beaufort, 3rd Duke of Somerset, was killed fighting for Lancaster in 1464 at the Battle of Hexham, the next brother, Edmund, succeeded to the Dukedom, and John became "Marquess of Dorset" and "Earl of Dorset", courtesy titles granted to the Beaufort heir-apparent or heir-presumptive.
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Margaret Beaufort was the daughter of John Beaufort, 1st Earl of Somerset (c.1371 – 16 March 1410), by Margaret Holland (c.1385/6 – c.1439/40), the daughter of Thomas Holland, 2nd Earl of Kent, and Alice Arundel.
Margaret Beaufort, Countess of Richmond and Derby (1443–1509), the daughter of John Beaufort, 1st Duke of Somerset (first creation) and the mother of Henry VII of England.