Joan of Navarre, Queen of England
Joan of Navarre, also known as Joanna( – 10 June 1437) was Duchess of Brittany by marriage to Duke John IV, and later Queen of England by marriage to King Henry IV.
She served as regent of Brittany from 1399 until 1403 during the minority of her son.
She also served as regent of England during the absence of her stepson, Henry V, in 1415.
Four years later he imprisoned her and confiscated her money and land.
Joan was released in 1422, shortly before Henry V's death.
Joan was a daughter of King Charles II of Navarre and Joan of France.
Gilles of Brittany
Gilles of Brittany (1420 - 25 April 1450) was a Breton prince and Lord of Chantocé.
He was the son of John V of Brittany and Joan of France, and the younger brother of the dukes Francis I and Peter II.
Joan of France, Duchess of Brittany
Joan of France (24 January 1391 – 27 September 1433) was Duchess of Brittany by marriage to
John V. She was a daughter of Charles VI of France and Isabeau of Bavaria.
Claude of France
Claude of France( 13 October 1499 – 20 July 1524) was a queen consort of France by marriage to Francis I.
She was also ruling Duchess of Brittany from 1514.
She was a daughter of the French king Louis XII of France and Anne of Brittany.
Margaret of France, Duchess of Berry
Margaret of France, Duchess of Berry (French: "Marguerite de Valois")
(5 June 1523 – 15 September 1574) was the daughter of King Francis I of France and Claude, Duchess of Brittany.
Marie of Blois, Duchess of Anjou
Marie of Blois( 1345- 1404) was a daughter of Joanna, Duchess of Brittany and Charles, Duke of Brittany.
Through marriage to Louis I, Duke of Anjou, she became Duchess of Anjou, Countess of Maine, Duchess of Touraine, titular Queen of Naples and Jerusalem and Countess of Provence.
Isabella of Brittany
Isabella of Brittany( 1411 – c. 1444) was a daughter of John V, Duke of Brittany, and his wife, Joan of Valois.
Isabella was a member of the House of Dreux.
Joan Holland, Duchess of Brittany
Lady Joan Holland (1350 – October 1384) was Duchess of Brittany as the second wife of John IV, Duke of Brittany.
She was the daughter of Joan of Kent and Thomas Holland, 1st Earl of Kent.
Her mother married secondly to Edward the Black Prince and was mother to Richard II.
Her marriage to John IV took place in London in May 1366, but without the approval of King Edward III of England, Joan's step-grandfather, who claimed overlordship of Brittany.
The couple had no children.
Joan's death, in her thirties, was politically inexpedient.
In 1386, two years afterwards, John IV married Joan of Navarre, later the queen of King Henry VI of England.
Charles VI of France
Charles VI (3 December 1368 – 21 October 1422), called the Beloved  and the Mad (or "le Fou"), was King of France for 42 years from 1380, until his death.
Robert le Maçon
Robert le Maçon( c. 1365 – 28 January 1443) was chancellor of France, advisor to Charles VII and supporter of Joan of Arc.

Question: What is the date of death of Joan Of France, Duchess Of Brittany's father?
Answer: 21 October 1422