Isabella of Bourbon
Isabella of Bourbon, Countess of Charolais( 1434 – 25 September 1465) was the second wife of Charles the Bold, Count of Charolais and future Duke of Burgundy.
She was a daughter of Charles I, Duke of Bourbon and Agnes of Burgundy, and the mother of Mary of Burgundy, heiress of Burgundy.
Maria of Portugal, Duchess of Viseu
Maria of Portugal, Duchess of Viseu (18 June 1521 – 10 October 1577 in Lisbon) was an Infanta of Portugal, the only daughter of King Manuel I of Portugal and Eleanor of Austria.
A noted patron of the arts, Maria's personal wealth rivaled that of the king, her brother (John III of Portugal), making her the richest woman in Portugal and one of the richest in Europe.
Agnes of France, Duchess of Burgundy
Agnes of France( c. 1260 – 19 December 1327) was a Duchess of Burgundy by marriage to Robert II, Duke of Burgundy.
She served as regent of Burgundy during the minority of her son in 1306 – 1311.
Isabella of France, Dauphine of Viennois
" For other persons named Isabella of France, see Isabella of France( disambiguation)" Isabella of France and Burgundy( 1310 – April 1348) was the daughter of Philip V of France and Joan II, Countess of Burgundy.
Isabel of Portugal, Lady of Viseu
Isabella of Portugal( 1364–1395) was the natural daughter of King Ferdinand I of Portugal, from an unknown mother.
Isabel of Coimbra
Infanta Isabel of Coimbra( Isabella of Portugal)
( 1 March 1432 – 2 December 1455) was a Portuguese infanta and a queen consort of Portugal as the first spouse of King Afonso V of Portugal.
Sibylla of Burgundy, Duchess of Burgundy
Sybilla of Burgundy( 1065 – 1103), was a French noble, Duchess consort of Burgundy by marriage to Eudes I, Duke of Burgundy.
She was a daughter of William I, Count of Burgundy and Stephanie.
She was married to Eudes I, Duke of Burgundy in 1080.
Children:
Isabella of Portugal, Duchess of Burgundy
Isabella of Portugal (22 February 1397 – 17 December 1471) was Duchess of Burgundy as the third wife of Duke Philip the Good.
Born a Portuguese "infanta" of the House of Aviz, Isabella was the only surviving daughter of King John I of Portugal and his wife Philippa of Lancaster.
Her son by Philip was Charles the Bold, the last Valois Duke of Burgundy.
Isabella was the regent of the Burgundian Low Countries during the absence of her spouse in 1432 and in 1441–1443.
She served as her husband's representative in negotiations with England regarding trade relations in 1439 and those with the rebellious cities of Holland in 1444.
Joan III, Countess of Burgundy
Joan III of Burgundy( 1/2 May 1308 – 10/15 August 1347), also known as Joan of France was a reigning Countess of Burgundy and Artois in 1330 – 1349, She was also Duchess of Burgundy by marriage to Odo IV, Duke of Burgundy.
She was the eldest daughter of King Philip V of France and Countess Joan II of Burgundy.
Philip the Good
Philip the Good (31 July 1396 – 15 June 1467) was Duke of Burgundy as Philip III from 1419 until his death.
He was a member of a cadet line of the Valois dynasty, to which all the 15th-century kings of France belonged.
During his reign, Burgundy reached the apex of its prosperity and prestige and became a leading center of the arts.
Philip is known in history for his administrative reforms, his patronage of Flemish artists such as Jan van Eyck and Franco-Flemish composers such as Gilles Binchois, and the capture of Joan of Arc.
In political affairs, he alternated between alliances with the English and the French in an attempt to improve his dynasty's position.
As ruler of Flanders, Brabant, Limburg, Artois, Hainaut, Holland, Zeeland, Friesland and Namur, he played an important role in the history of the Low Countries.

Question: When was Isabella Of Portugal, Duchess Of Burgundy's husband born?
Answer: 31 July 1396