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.
Princess Catherine Beatrice of Savoy
Catherine Beatrice of Savoy( 6 November 1636, Turin, Piedmont – 27 August 1637) was a Princess of Savoy by birth.
She was the youngest daughter born to Victor Amadeus I, Duke of Savoy, and his French consort, Princess Christine Marie of France.
Charles Amadeus, Duke of Nemours
Charles Amadeus of Savoy, Duke of Nemours( 12 April 162430 July 1652) was a French military leader and magnate.
He was the father of the penultimate Duchess of Savoy and of a Queen of Portugal.
Marie of Brabant, Countess of Savoy
Marie of Brabant( 1277/80–1338), was a Countess Consort of Savoy; married in 1297 to Amadeus V, Count of Savoy.
She was the daughter of John I, Duke of Brabant and Margaret of Flanders.
Issue:
Yolande Louise of Savoy
Yolande Louise of Savoy( 1487–1499), was a Duchess Consort of Savoy; married to Philibert II, Duke of Savoy.
Princess Luisa Cristina of Savoy
Princess Luisa Cristina of Savoy (27 July 1629 – 12 May 1692) was a Princess of Savoy by birth and the eldest daughter of Victor Amadeus I, Duke of Savoy.
She married her uncle Prince Maurice of Savoy but had no children.
She was the owner of the future "Villa della Regina".
She was a first cousin of Louis XIV of France and Charles II of England.
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.
Maria Beatrice of Savoy
Maria Beatrice of Savoy (Maria Beatrice Vittoria Giuseppina; 6 December 1792 – 15 September 1840) was a Princess of Savoy and Duchess of Modena by marriage.
Mary of Burgundy, Duchess of Savoy
Mary of Burgundy (French: Marie de Bourgogne; 1386–1428) was a Duchess of Savoy by her marriage to Amadeus VIII of Savoy, later known as Antipope Felix V.
Marie of Savoy, Duchess of Milan
Marie of Savoy (1411–1469) was a daughter of Amadeus VIII, Duke of Savoy (later the Antipope Felix V) and Mary of Burgundy.
She married Filippo Maria Visconti, the Duke of Milan in 1428.
They had no children.

Question: Who is the paternal grandfather of Marie Of Savoy, Duchess Of Milan?
Answer: Amadeus VII, Count of Savoy