Sir John Beaufort 1st Earl of Somerset, Marquis of Dorset and Somerset Plantagenet
- Born: 1371, Chãateau De Beaufort, Maine-et-Loire, Pays de la Loire Franc
- Marriage (1): Lady Margaret Countess (De Holand) Somerset Plantagenet on 28 Sep 1397 in Upholland Castle, Upholland, Lancashire England 441
- Died: 16 Mar 1410, St Catherines Hospital by the Tower, London, Middlesex England at age 39
- Buried: Abbey church on Tower Hill, London, Middlesex England 441
John married Lady Margaret Countess (De Holand) Somerset Plantagenet on 28 Sep 1397 in Upholland Castle, Upholland, Lancashire England.441 (Lady Margaret Countess (De Holand) Somerset Plantagenet was born in 1385 in Upholland, Lancashire England, died on 30 Dec 1439 in St Saviours Monastery, Bermondsey, London, Surrey England and was buried in Canterbury Cathedral, Canterbury, Kent England 441.)
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