John’s marriage to Blanche of Lancaster gave him wealth and land – including thirty castles across England. He held Kenilworth, Pontefract, Lincoln, Leicester, Tutbury and Monmouth to name but a few. Blanche died on 12 September 1368 at Tutbury.
Three years later on 21st September 1371 John married Constanza or Constance of Castile. The following year at the beginning of February she made a state entry to London. The marriage gave John a claim to the kingdom of Castile by right of his new wife. Constance was the daughter of King Pedro – or Pedro the Cruel – John had had himself proclaimed King of Castile on January 29th. The state entry reinforced John’s new status and the reason behind it.
Pedro had been usurped by his half-brother Henry of Trastamara and having fled across the Pyrenees sought the help of Gaunt’s elder brother the Black Prince. There were many more twists in the plot but ultimately Henry murdered his brother and claimed the kingdom of Castile ignoring the rights of Constance who was safely in english held territory along with her younger sister Isabella. It was the Black Prince who escorted Constance into London in February 1372. The marriage was a dynastic one – shortly after the second marriage Gaunt began his affair with Katherine Swynford.
In the meantime Constance bore two children. John was born in 1374 but died the following year. Catherine or Catalina of Lancaster was born in early 1373 or possibly late 1372. Her marriage, like her half sister Philippa’s, reflected John’s Iberian political aspirations but one of her descendants would be at the centre of a scandal that shook England’s religious foundations.
It was only in 1386 that John was able to raise the funds to mount an invasion of Castile in aid to claim his throne after the King of Portugal defeated the Castilians. The money came from a loan granted by Richard II on the understanding that it would be repaid once John had his throne. Richard was leased to see the back of his dominant uncle whilst the nobility – or extended family as you’ve probably now come to think of them- resented his power. There was an underlying fear that he might seek the throne of England for himself.

Catherine of Aragon, c. 1496, portrait by Juan de Flandes. Fine Art Images/Heritage Images/Getty Images
The Iberian Campaign was not a rip roaring success. John couldn’t get his Castilian allies to give battle and it wasn’t long before disease began to decimate his army. The Treaty of Bayonne saw John give up his claim to the Castilian throne. In return he received a sizeable payout and his daughter Catalina was betrothed to Henry of Castile. She married him in 1388 and had several children including John II of Castile in inherited the throne whilst still a child. Her great grand daughter was Catherine of Aragon…back to the cousin issue again! This picture is in the post because its one of my absolute favourites!
Constanza died in March 1394 at Leicester. Two years later John of Gaunt married Katherine Swynford. John was fifty-six. Katherine was forty-six. She had no power, wealth or title from which John might benefit but she did already have four children by John.

The newly married pair were supposed not to co-habit but a son Edward was born in 1382 who lived only four days. In September 1386 Mary gave birth to her a son named Henry. It is possible that there has been a confusion about Edward and that Mary and Henry were not his parents at all – the gap between pregnancies suggests that Henry was the eldest son born after Mary was deemed old enough to live with her groom. Thomas followed in 1387, John in 1389, Humphrey in 1390, Blanche in 1392, and Philippa in 1394. Records indicate that Henry sent apples and pears as well as shell fish to his pregnant wife. Mary died in 1394 in her mid twenties.


The last post was about the turbulent life of Elizabeth of Lancaster, second daughter of John of Gaunt with her second husband John Holland, sometime Duke of Exeter. The couple had five children.
Gaunt married Blanche of Lancaster on 19 May 1359 by 1361 he had been created Earl of Lancaster by right of his wife who was a co-heiress with her elder sister Matilda who died soon after. Gaunt became the Duke of Lancaster in November 1362. The Lancaster inheritance made him extremely wealthy.
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.
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.



So that just leaves Anne Mortimer who was born in 1390. Anne married Richard of Conisburgh the youngest son of Edmund of Langley Duke of York who I have yet to post about. It was Richard’s sister Constance who plotted to send Anne’s brothers to their uncle in Wales in 1405. The marriage between Richard and Anne Mortimer took place as early as 1406.(
Lionel (1338-1368) was Edward III’s second surviving son. He was the one who managed to get himself poisoned by his new -in-laws when he went to Milan – not that anything has ever been definitively proved. So far so straight forward. However, this is where Edward III’s descendants start to become less easy to track and the familial intermarriages more complicated.
The Black Prince, Edward of Woodstock, did not get married until 1361 when he was thirty. He chose to marry his first cousin once removed – Joan of Kent who was a few years older than him. She had already been married twice before, once bigamously. The pair married and had two children: Edward of Anglôume born in 1365 who died when he was five and Richard of Bordeaux born in 1367.

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.

