William of Savoy
William of Savoy( died 1239 in Viterbo) was a bishop from the House of Savoy.
He was a son of Thomas, Count of Savoy and Margaret of Geneva.
He was elected bishop of Valence in 1224.
He negotiated the weddings of queens, and was an advisor to Henry III of England.
Between his religious roles and his family relations, his influence was noted from London to Rome.
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.
Yolande, Duchess of Lorraine
Yolande( 2 November 1428, Nancy – 23 March 1483, Nancy), was Duchess of Lorraine( 1473) and Bar( 1480).
She was the daughter of Isabella, Duchess of Lorraine, and René of Anjou( King of Naples, Duke of Anjou, Bar and Lorraine, Count of Provence).
Though she was nominally in control of major territories, she ceded her power and titles to her husband and her son.
In addition, her younger sister was Margaret of Anjou, Queen of England.
In the 19th century, a romanticised version of her early life was popularised by the play" King René ’s Daughter" by Henrik Hertz, in which she is portrayed as a beautiful blind princess living in an isolated garden paradise.
It was later adapted to Tchaikovsky's opera" Iolanta".
There is no evidence that she was ever blind.
Amadeus VIII, Duke of Savoy
Amadeus VIII (4 September 1383 – 7 January 1451) was a Savoyard nobleman, the son of Amadeus VII, Count of Savoy and Bonne of Berry.
He was surnamed the Peaceful.
After the death of his father in 1391, his mother acted as a regent, because of his youth.
He was an antipope of the Catholic Church from 1439 to 1449 as Felix V, in opposition to Popes Eugene IV and Nicholas V.
Nicholas Vaux, 1st Baron Vaux of Harrowden
Nicholas Vaux, 1st Baron Vaux of Harrowden( c. 1460 – 14 May 1523) was a soldier and courtier in England and an early member of the House of Commons.
He was the son of Lancastrian loyalists, Sir William Vaux of Harrowden and Katherine Penyson( or Peniston as she is sometimes called in later sources), a lady of the household of Queen Margaret of Anjou, wife of the Lancastrian king, Henry VI of England.
Katherine was daughter of Gregorio Panizzone of Courticelle( modern Cortiglione), in Piedmont, Italy which was at that time subject to King René of Anjou, father of Queen Margaret of Anjou, as ruler of Provence.
He grew up during the years of Yorkist rule, and later served under the founder of the Tudor dynasty, Henry VII.
Margaret of Savoy, Duchess of Anjou
Margaret of Savoy (7 August 1420 – 30 September 1479), was a daughter of Amadeus VIII of Savoy and Mary of Burgundy.
By her three illustrious marriages, she held a number of titles, including "Duchess of AnjouDuchess of CalabriaCountess of MaineCountess of the Palatinate", and "Countess of Württemberg".
Isabella of Savoy
Isabella of Savoy (11 March 1591 – 28 August 1626) was a daughter of Charles Emmanuel I, Duke of Savoy, and Catherine Michelle of Spain.
Her maternal grandparents were Philip II of Spain and Elisabeth of Valois, her paternal grandparents were Emmanuel Philibert, Duke of Savoy and Margaret of France, Duchess of Berry.
She was the Hereditary Princess of Modena, dying before her husband succeeded to the Duchy of Modena in 1628.
Beatrice of Savoy
Beatrice of Savoy( c. 1198 – c. 1267) was the daughter of Thomas I of Savoy and Margaret of Geneva.
She was Countess consort of Provence by her marriage to Ramon Berenguer IV, Count of Provence.
Yolande Louise of Savoy
Yolande Louise of Savoy( 1487–1499), was a Duchess Consort of Savoy; married to Philibert II, Duke of Savoy.
Bona of Savoy
Bona of Savoy, Duchess of Milan( 10 August 1449 – 23 November 1503) was Duchess consort of Milan as the second spouse of Galeazzo Maria Sforza, Duke of Milan.
She served as regent of Milan during the minority of her son 1476 – 1481.

Question: When was Margaret Of Savoy, Duchess Of Anjou's father born?
Answer: 4 September 1383