John of Valois, Count of Montpensier
John of Berry( 1375/1376–1397), count of Montpensier( 1386 – 1401), was a French nobleman.
He was the son of John, Duke of Berry, and of Joanna of Armagnac.
He had no children and predeceased his father.
He married twice:
Otto, Duke of Brunswick-Grubenhagen
Otto, Duke of Brunswick- Grubenhagen( 1320 – 1 December 1398) was the fourth and last husband of Joanna I of Naples.
He also held the title of Prince of Taranto.
His nickname was Otto the Tarantine.
Andrew, Duke of Calabria
Andrew, Duke of Calabria( 30 October 1327 – 18 September 1345) was the first husband of Joanna I of Naples, and a son of Charles I of Hungary and brother of Louis I of Hungary.
Bonne of Bourbon
Bonne of Bourbon( 1341 – 19 January 1402) was a daughter of Peter I, Duke of Bourbon, and Isabella of Valois, and hence a sister of Joanna of Bourbon.
She served as regent of Savoy during the absence of her spouse from 1366 to 1367, in 1383, and during the minority of her grandson Count Amadeus VIII in 1391.
Peter II, Duke of Bourbon
Peter II, Duke of Bourbon (1 December 1438 – 10 October 1503 in Moulins), was the son of Charles I, Duke of Bourbon, and Agnes of Burgundy, and a member of the House of Bourbon.
He and his wife Anne of France ruled as regents during the minority of Charles VIII of France.
Joanna of Bourbon
Joanna of Bourbon (3 February 1338 – 6 February 1378) was Queen of France by marriage to
King Charles V. She acted as his political adviser and was appointed potential regent in case of a minor regency.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
Reforce d'Agoult
Reforce d' Agoult was the Angevin seneschal of medieval Lombardy, under the reign of Joanna I of Naples.
Killed in battle at Gamenario, he was replaced by Roberto di Luinardo.
Beatrice of Bourbon, Queen of Bohemia
Beatrice of Bourbon( 1320 – 23 December 1383) was a French noblewoman.
A member of the House of Bourbon, she was by marriage Queen of Bohemia and Countess of Luxembourg.
She was the youngest daughter of Louis I, Duke of Bourbon, and Mary of Avesnes.
Charles V of France
Charles V (21 January 1338 – 16 September 1380), called the Wise , was King of France from 1364 to his death.
His reign marked a high point for France during the Hundred Years' War, with his armies recovering much of the territory held by the English, and successfully reversed the military losses of his predecessors.
In 1349, as a young prince, Charles received from his grandfather King Philip VI the province of Dauphiné to rule.
This allowed him to bear the title "Dauphin" until his coronation, which led to the integration of the Dauphiné into the crown lands of France.
After 1350, all heirs apparent of France bore the title of Dauphin until their accession.
Charles became regent of France when his father John II was captured by the English at the Battle of Poitiers in 1356.
To pay for the defense of the kingdom, Charles raised taxes.
As a result, he faced hostility from the nobility, led by Charles the Bad, King of Navarre; the opposition of the French bourgeoisie, which was channeled through the Estates-General led by Étienne Marcel; and with a peasant revolt known as the Jacquerie.
Charles overcame all of these rebellions, but in order to liberate his father, he had to conclude the Treaty of Brétigny in 1360, in which he abandoned large portions of south-western France to Edward III of England and agreed to pay a huge ransom.
Charles became king in 1364.
With the help of talented advisers, his skillful management of the kingdom allowed him to replenish the royal treasury and to restore the prestige of the House of Valois.
He established the first permanent army paid with regular wages, which liberated the French populace from the companies of routiers who regularly plundered the country when not employed.
Led by Bertrand du Guesclin, the French Army was able to turn the tide of the Hundred Years' War to Charles' advantage, and by the end of Charles' reign, they had reconquered almost all the territories ceded to the English in 1360.
Furthermore, the French fleet, led by Jean de Vienne, managed to attack the English coast for the first time since the beginning of the Hundred Years' War.
Charles V died in 1380.
He was succeeded by his son Charles VI, whose disastrous reign allowed the English to regain control of large parts of France.

Question: What is the date of death of Joanna Of Bourbon's husband?
Answer: 16 September 1380