Today we have arrived at the third surviving son of Edward III – John of Gaunt, Duke of Lancaster. I’ve posted about him before so I don’t intend to write about him in any great detail here – but there is a very tangled Plantagenet skein to unravel in terms of his children.
John married three times – his first marriage was to Blanche of Lancaster. She was the daughter of Henry of Grosmont, Duke of Lancaster. His grandfather was Edmund Crouchback, the younger brother of Edward I. This makes Blanche the great-great-grand-daughter of Henry III (yes- another one.) Her mother Isabella de Beaumont came from an equally prestigious bloodline. Her great grandfather was King of Jerusalem and somewhere along the line, inevitably, there was some Plantagenet blood flowing in Isabella’s veins.
During the latter part of the 1350s Edward III was looking to provide wealth and land for his older sons. Blanche married John of Gaunt at Reading Abbey in May 1359. Blanche gave birth to seven children between 1360 and her death in 1368 but only three survived to adulthood: Philippa, Elizabeth and Henry of Bolingbroke. Philippa married into the royal house of Portugal in 1387 as part of the Treaty of Windsor so for the time being we can remove her from the intersecting Plantagenet lines – possibly with a huge sigh of relief.
When Henry of Bolingbroke usurped his cousin Richard II one of the pieces of “fake news” circulated by Lancaster sympathisers to justify the take over was that Edmund Crouchback was actually Edward I’s older brother but that because he was deformed, the younger brother took the crown. This was a fabrication. Edmund was called Crouchback because he had taken the cross and gone on Crusade. It is interesting none-the-less that Henry IV made his claim not from his grandfather Edward III but from his maternal link to Henry III.

Constanza of Castile – the source is the British Library
Gaunt’s second wife was Constance (Constanza) of Castile. John had aspirations to wear his own crown rather than simply watch over this nephew Richard II and there were plenty of members of Richard’s council who were delighted when John developed a continental interest. The marriage produced a child Catherine in 1372, a year after the marriage, followed by a son John who did not survive infancy. Catherine married Henry III of Castile and became the country’s regent during the minority of her son – John II of Castile.
Just to add to the familial knot:- Gaunt’s brother, Edmund of Langley – Duke of York married Constanza’s sister Isabella of Castile who was the mother of his children rather than his second wife Joan Holland.

The third wife is the famous one – Katherine Swynford. John married her in 1396 but the couple had begun an affair soon after Blanche of Lancaster’s death and the death of Katherine’s husband Hugh. Kathryn’s eldest son by John was born the year after Constance of Castile had Catherine. There were four members of the Beaufort brood – John, Henry, Thomas and Joan. When John married Katherine he arranged for the entire family to be legitimised by the Church and the State.
Where does that leave us – aside from the need for a fortifying cup of tea? It leaves us with the two children from John’s marriage to Blanche of Lancaster who remained in England and the four from his relationship with Katherine Swynford – but as Cardinal Henry Beaufort had no legitimate children we are left with a total of five children who married and extended the Plantagenet line – which isn’t so bad until you realise exactly how large Joan Beaufort’s family actually was!
Next time: John of Gaunt’s Lancaster children – Philippa, Elizabeth and Henry. Be ready for the complications of Elizabeth’s marriage!
Weir, Alison. Britain’s Royal Families


John’s wealth and title came from his marriage to the co-heiress Blanche of Lancaster. Her father had been the 1st Duke of Lancaster but on his death with no male heirs the title died out. When John married Blanche he was given the title earl and through Blanche half of the Lancaster wealth. Blanche’s sister died in 1362 without children – the Lancaster wealth now all came to John. On the same day that Lionel received his dukedom from his father the dukedom of Lancaster was resurrected for John. Because the dukedom had been dormant and Edward III resurrected it John of Gaunt was also known as the 1st Duke of Lancaster (why would you want things to be straight forward!). John married three times – firstly to Blanche who was descended from Henry III via his second son Edmund Crouchback; secondly to Constanza of Castile by whose right John would try to claim the crown of Castile and thirdly to his long time mistress Kathryn Swynford with whom he had four illegitimate children surnamed Beaufort who were ultimately legitimised by the Papacy and by King Richard II.

Being a girl, daughter of a minor and somewhat impecunious Lincolnshire knight claiming descent back to the Saxons, no one thought it sufficiently important to make note of Blanche Swynford’s date of birth. Of course, History reveals little Blanche to be the god-daughter of John of Gaunt and daughter of Katherine Swynford. Nor for that matter is History terribly sure about the number of her sisters.
The need to apply for papal dispensation where cousins removed were to be married often fitted into a rather lengthy negotiation process where the marriage was more of a seal on an alliance than a love match. Prior to a couple’s betrothal a financial settlement had to be agreed. A bride’s family was expected to settle a dowry upon her. This was her share of her inheritance. It often took the form of goods and cash as well as land which her own mother might have brought into her own marriage. In return the bride would receive dower rights from the lands which her groom held i.e. the income from those lands was hers. Once the marriage settlement had been agreed then there would be a betrothal ceremony. Given that these betrothals often took place where at least one of the participants was a very young child the betrothal wasn’t always binding. Effectively where children had not yet reached the age of reason it was much easier to wriggle out of a marriage alliance than after. Margaret Beaufort was betrothed by her guardian to his son John de la Pole at the age of six but was rebetrothed on the orders of Henry VI to his half-brother Edmund Tudor three years later. Seven was regarded as the age of reason and after that time is was harder to break a betrothal. A full coming of age was twelve for girls and fourteen for boys though even at the time Edmund Tudor’s treatment of his child bride raised eyebrows.


ally, however, Parliament became involved with the process of identifying the order in which monarchs would ascend the throne.
As it happened none of Henry IV’s children did much in the way of begetting. Thomas, Duke of Clarence was killed at the Battle of Bauge in 1421. Henry V married Katherine of Valois and had one son who became Henry VI by the time he was nine months old in 1422. John, Duke of Bedford was married twice. His second wife was Jacquetta of Luxembourg who went on to marry one of John’s household knights and have a large family including her daughter Elizabeth Woodville. John of Bedford, on the other hand, had no legitimate children. Humphrey, Duke of Gloucester was initially married to Jacqueline of Hainault but the marriage was annulled without surviving issue. Humphrey then went on to marry his mistress Eleanor Cobham who was ultimately found guilty of witchcraft and imprisoned. He didn’t have legitimate children either. Given that Henry IV had six children who survived to adulthood he possibly didn’t anticipate that his line would prove quite so unprolific when he arranged for Parliament to pass the 1406 Act of Succession.

