Sir John DE GANT, Duc De Lancaster 
- Born: 6 Mar 1340, Abbaye Saint-Bavon, Gand, Flandres, Belgique
- Marriage: Catherine DE ROET  on 13 Jan 1396 in Cathedral Church, Lincoln, Lincolnshire, England
- Died: 3 Feb 1399, , , England at age 58
- Buried: St Paul's Cathedral, London, England
Other names for John were DE GAND and DE GHENT.
Sources, Comments and Notes:
"Jean de Gand (mars 1340 à l'abbaye Saint-Bavon de Gand - 3 février 1399), ...
En troisièmes et dernière noces, il épouse à Lincoln, le 13 janvier 1396, Catherine Swynford de Roët (1350-1403), fille de Payne de Roët. Elle était la sœur de Philippa de Roët, épouse de Geoffrey Chaucer. Ils eurent quatre enfants (nés avant le mariage de leurs parents, ils furent légitimés sous le nom de Beaufort, du nom de la châtellenie de Beaufort en Champagne, aujourd'hui Montmorency-Beaufort, appartenant à la maison de Lancastre) :
- Jean Beaufort (1371-1410), comte de Somerset, arrière-grand-père d'Henri VII, roi d'Angleterre.
- Henri Beaufort (1375-1447), évêque de Lincoln et Winchester puis cardinal, légat du pape.
- Thomas Beaufort (1377-1426), duc d'Exeter
- Jeanne Beaufort (1379-1440), mariée à Robert de Ferrières, puis à Ralph Neville, 5e baron Neville de Raby en 1388, 1er comte de Westmorland en 1397."
"John of Gaunt, 1st Duke of Lancaster
John of Gaunt (Ghent), 1st Duke of Lancaster (second creation), KG (6 March 1340 \endash 3 February 1399) was a member of the House of Plantagenet, the third surviving son of King Edward III of England and Philippa of Hainault. He was called "John of Gaunt" because he was born in Ghent, then known as Gaunt in English.
John exercised great influence over the English throne during the minority of his nephew, Richard II, and during the ensuing periods of political strife, but was not thought to have been among the opponents of the king.
John of Gaunt's legitimate male heirs, the Lancasters (the other party in the Wars of the Roses, the Yorks, being the male descendants of his older brother, Lionel of Antwerp, 1st Duke of Clarence, and younger brother, Edmund), included Kings Henry IV, Henry V, and Henry VI. His other legitimate descendants included his daughters Queen Philippa of Portugal, wife of John I of Portugal and mother of King Edward of Portugal, and Elizabeth, Duchess of Exeter, mother of John Holland, 2nd Duke of Exeter, through his first wife, Blanche; and by his second wife, Constance, John was father of Queen Catherine of Castile, wife of Henry III of Castile and mother of John II of Castile. John fathered five children outside marriage, one early in life by a lady-in-waiting to his mother, and four surnamed "Beaufort" by Katherine Swynford (after a former French possession of the Duke), Gaunt's long-term mistress and third wife. The Beaufort children, three sons and a daughter, were legitimized by royal and papal decrees after John and Katherine married in 1396, with the proviso that they were specifically barred from inheriting the throne ('excepta regali dignitate'). Descendants of this marriage included Henry Beaufort, Bishop of Winchester and eventually Cardinal; Joan Beaufort, Countess of Westmorland, grandmother of Kings Edward IV and Richard III; John Beaufort, 1st Earl of Somerset, the great-grandfather of King Henry VII; and Joan Beaufort, Queen of Scots, from whom are descended, beginning in 1437, all subsequent sovereigns of Scotland, and successively, from 1603 on, the sovereigns England, of Great Britain and Ireland, and of the United Kingdom to the present day. The three preceding houses of English sovereigns from 1399 - the Houses of Lancaster, York and Tudor - were descended from John through, respectively, Henry Bolingbroke, Joan Beaufort and John Beaufort.
When John died in 1399, his estates were declared forfeit as King Richard II had exiled John's son and heir, Henry Bolingbroke, in 1398. Bolingbroke returned from exile to reclaim his inheritance and deposed Richard. Bolingbroke then reigned as King Henry IV of England (1399\endash 1413), the first of the descendants of John of Gaunt to hold the throne of England.
John of Gaunt was buried beside his first wife, Blanche of Lancaster, in the nave of Old St. Paul's Cathedral in an alabaster tomb designed by Henry Yevele (similar to that of his son in Canterbury Cathedral)."
... Marriages and descendants
Coat of arms of John of Gaunt asserting his kingship over Castile and Leon, combining the Castilian castle and lion with lilies of France, the lions of England and his heraldic difference
John's first child was an illegitimate daughter, Blanche (1359-1388/89). Blanche was the daughter of John's mistress Marie de St. Hilaire of Hainaut (1340-after 1399), who was a lady in waiting to his mother, Queen Philippa. The affair apparently took place before John's first marriage, which was to his cousin Blanche of Lancaster. John's daughter, Blanche, married Sir Thomas Morieux in 1381. Morieux held several important posts, including Constable of the Tower the year he was married, and Master of Horse to King Richard II two years later. He died in 1387 after six years of marriage.
On 19 May 1359 at Reading Abbey, John married his third cousin, Blanche of Lancaster, daughter of Henry of Grosmont, 1st Duke of Lancaster. The wealth she brought to the marriage was the foundation of John's fortune. Blanche died of bubonic plague on 12 September 1369 at Bolingbroke Castle, while her husband was away at sea. Their son Henry Bolingbroke became Henry IV of England. Their daughter Philippa became Queen of Portugal by marrying King John I of Portugal in 1387. All subsequent kings of Portugal were thus descended from John of Gaunt.
In 1371, John married Infanta Constance of Castile, daughter of King Peter of Castile, thus giving him a claim to the Crown of Castile, which he would pursue. Though John was never able to make good his claim, his daughter by Constance, Katherine of Lancaster, became Queen of Castile by marrying Henry III of Castile.
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.
All monarchs of England and later of Great Britain, the United Kingdom and the Commonwealth Realms from Henry IV onwards are descended from John of Gaunt.
By Marie de St. Hilaire of Hainaut, mistress:
Blanche(1359\endash 1388/89), married Sir Thomas Morieux (1355\endash 1387) in 1381, without issue
By Blanche of Lancaster:
Philippa (1360\endash 1415), married King John I of Portugal (1357\endash 1433)
John (1362\endash 1365), he was the first born son of John and Blanche of Lancaster and lived possibly at least until after the birth of his brother Edward of Lancaster in 1365 and died before his second brother another short lived boy called John in 1366. He was buried Church of St Mary de Castro, Leicester.
Elizabeth (1364\endash 1426), married (1) in 1380 John Hastings, 3rd Earl of Pembroke (1372\endash 1389), annulled 1383; married (2) in 1386 John Holland, 1st Duke of Exeter (1350\endash 1400); (3) Sir John Cornwall, 1st Baron Fanhope and Milbroke (d. 1443)
Edward (1365) he died later the same year of his birth; He was buried Church of St Mary de Castro, Leicester
John (1366\endash 1367) he most likely died after the birth of his younger brother Henry the future Henry IV of England; Buried Church of St Mary de Castro, Leicester
Henry IV of England (1367\endash 1413), married (1) Mary de Bohun (1369\endash 1394); (2) Joanna of Navarre (1368\endash 1437)
Isabel (1368\endash 1368)
By Constance of Castile:
Catherine (1372\endash 1418), married King Henry III of Castile (1379\endash 1406)
John (1374\endash 1375)
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."
Ghent (Dutch: Gent, pronounced [??nt]; French: Gand, pronounced: [???]; and formerly Gaunt in English; from the Classic Latin term Candia or Gandia meaning landlock by the confleunce of rivers by the union of the Celtic term "Cand" and Latin "ia" land) is a city and a municipality located in the Flemish region of Belgium. It is the capital and biggest city of the East Flanders province. The city started as a settlement at the confluence of the Rivers Scheldt and Lys and in the Middle Ages became one of the largest and richest cities of northern Europe. Today it is a busy city with a port and a university."
"... 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
4. Edward Neville, born ca. 1412 = Catharine Howard (2nd wife)
5. Catharine Neville, born ca. 1450 = Robert Tanfield
6. William Tanfield, born ca. 1480 = Isabel Stavely
7. Catharine Tanfield = John Gilbert
8. William Gilbert, Vicar of Barton Turf = Ellen Furford
9. Ellen Gilbert, died 10 Jan. 1582 = Nicholas Wright, born ca. 1538, married 18 February 1559, died 1 October 1582."
John married Catherine DE ROET  [MRIN: 588], daughter of Sir Paon II DE ROEULX, Jr, Knt.  and Unknown, on 13 Jan 1396 in Cathedral Church, Lincoln, Lincolnshire, England. (Catherine DE ROET  was born on 25 Nov 1350 in Le Roeulx, Hainaut, Belgique, died on 10 May 1403 in , , England and was buried in Cathedral Church, Lincoln, Lincolnshire, England.)