 John (Marquis of Somerset) Beaufort, son of John Plantagenet and Katherine De Roet Swinford Deroet.Born 1371 Beaufort, Maine-et-Loire, Pays de la Loire, France, died 16 Mar 9/10 London, London, England, approximately -1362 years Married 28 sep 1397 Upholland, Lancashire, England (42 years married) to:  Margaret De Holand, daughter of Thomas De Holand and Alice Fitzalan.Born 1385 Upholland, Lancashire, England, died 30 Dec 1439 Bermondsey, Surrey, England, 53 or 54 years Children: 2. Edmund BeaufortBorn 1406, died 22 May 1455 St Albans, Somerset, Maine, USA, 48 or 49 years 3. Joan Somerset De BeaufortBorn E1406, died 15 Jul 1445 Dunbar, East Lothian, Scotland, 38 or 39 years | |||