Catherine DE ROET 
- Born: 25 Nov 1350, Le Roeulx, Hainaut, Belgique
- Marriage: Sir John DE GANT, Duc De Lancaster  on 13 Jan 1396 in Cathedral Church, Lincoln, Lincolnshire, England
- Died: 10 May 1403, , , England at age 52
- Buried: Cathedral Church, Lincoln, Lincolnshire, England
Other names for Catherine were Katherine, ROELT, ROUET, RUET, SWYNFORD and SYNFORD.
Sources, Comments and Notes:
"Katherine Swynford, née (de) Roet (25 novembre 1350-10 mai 1403), est la fille de Payne de Roet, héraut flamand du comté de Hainault qui est adoubé juste avant sa mort lors d'une bataille. Katherine devient la troisième femme du prince anglais Jean de Gand, duc de Lancastre, et leurs descendants forment la famille Beaufort qui joue un rôle majeur dans la Guerre des Deux Roses. Henri VII d'Angleterre, qui devient roi d'Angleterre en 1485, tient sa revendication du trône de sa mère, Lady Margaret Beaufort, qui est une arrière-petite-fille de Katherine Swynford. L'actuelle reine, Élisabeth II est ainsi une descendante directe de Katherine."
"... During his marriage to Constance, John of Gaunt had fathered four children by a mistress, the widow Katherine Swynford (whose sister Philippa de Roet was married to Chaucer). Prior to her widowhood, Katherine had borne at least two, possibly three, children to Lancastrian knight Sir Hugh Swynford. The known names of these children are Blanche and Thomas. (There may have been a second Swynford daughter.) John of Gaunt was Blanche Swynford's godfather.
Constance died in 1394. John married Katherine in 1396, and their children, the Beauforts, were legitimised by King Richard II and the Church, but barred from inheriting the throne. From the eldest son, John, descended a granddaughter, Margaret Beaufort, whose son, later King Henry VII of England, would nevertheless claim the throne...
... Children ...
By Katherine Swynford (née de Roet/Roelt), mistress and later wife (children legitimised 1397):
John Beaufort, 1st Earl of Somerset (1373\endash 1410) \endash married Margaret Holland.
Henry Beaufort, Bishop of Winchester and Cardinal (1375\endash 1447)
Thomas Beaufort, Duke of Exeter (1377\endash 1427), married Margaret Neville.
Joan Beaufort (1379\endash 1440) \endash married first Robert Ferrers, 5th Baron Boteler of Wem and second Ralph Neville, 1st Earl of Westmoreland...."
"Katherine Swynford, Duchess of Lancaster (also spelled Synford), née (de) Roet (also spelled (de) Rouet, (de) Roët, or (de) Roelt) (probably 25 November 1350 \endash 10 May 1403), was the daughter of Sir Payne (or Paen/Pain/Paon) (de) Roet (also spelled (de) Rouet, (de) Roët or (de) Roelt), a Flemish herald from Hainault.
Katherine became the third wife of John of Gaunt, Duke of Lancaster, and their descendants were the Beaufort family, which played a major role in the Wars of the Roses. Henry VII, who became King of England in 1485, derived his claim to the throne from his mother Lady Margaret Beaufort, who was a great-granddaughter of Katherine Swynford.
Spouse Hugh Swynford and John of Gaunt, Duke of Lancaster
John Beaufort, 1st Earl of Somerset
Henry Beaufort, Cardinal
Thomas Beaufort, 1st Duke of Exeter
Joan Beaufort, Countess of Westmorland
House House of Lancaster (by marriage)
Father Payne de Roet
Born 25 November 1350
Died 10 May 1403 (aged 52)..."
Source <http://mccurdyfamilylineage.com/ancestry/p279.htm#i34078> :
"Catharine was born in 1350. Catharine married John of Gaunt (?), son of Edward III - King of England. Catharine departed this life on Tuesday, 10 May 1403 at age 53 years. Her sister, Philippa Roet m. Geoffrey Chaucer, the poet. They were the great, great grandparents of Henry VII."
"Rœulx est une commune française, située dans le département du Nord et la région Nord-Pas-de-Calais.
Personnalités liées à la commune
Catherine de Roet passa en Angleterre à la suite de Philippa de Hainaut et devint duchesse de Lancastre."
"... Pedigree of Gilbert. [For further information, see the overview chart of lineal ancestors of King Edward III of England and Philippa of Hainault , or the off-site hyperlinked genealogy of English and other royalty, with some annotations (proper names at or near the top of the following chart are linked to the second of these sources).]
1. Edward III, King of England born 13 Nov. 1312, Windsor, died 21 June 1377, London = Philippa of Hainault, born about 1312, Hainault, Belgium, married 24 January 1327, died 14/15 August 1369, Windsor
2. John of Gaunt, born March 1340, mar. 20 Feb. 1397, died 3 Feb. 1398 = Catharine Roet, 3rd wife, born 1350, died 10 May 1403. (Her sister Philippa Roet married Geoffrey Chaucer, the poet.) They were great-great-grandparents of Henry VII (Tudor)
3. Joan de Beaufort, born ca. 1375 Beaufort, Anjou, died 13 Nov. 1440, Howden, Yorks = Ralph Neville, born 1364 Raby Castle, Durham, died 21 Oct. 1425 ..."
Catherine married Sir John DE GANT, Duc De Lancaster  [MRIN: 588], son of King Edouard III OF ENGLAND  and Philippa DE HAINAUT , on 13 Jan 1396 in Cathedral Church, Lincoln, Lincolnshire, England. (Sir John DE GANT, Duc De Lancaster  was born on 6 Mar 1340 in Abbaye Saint-Bavon, Gand, Flandres, Belgique, died on 3 Feb 1399 in , , England and was buried in St Paul's Cathedral, London, England.)