Élisabeth Marguerite d'Orléans
Élisabeth Marguerite d'Orléans( 26 December 1646- 17 March 1696), known as Isabelle d' Orléans, was the Duchess of Alençon and, during her husband's lifetime, Duchess of Angoulême.
She was a daughter of Gaston d'Orléans and a first cousin of Louis XIV of France.
She has no descendants today.
She was" suo jure" Duchess of Alençon and Angoulême.
Isabella of Valois
Isabella of France (9 November 1389 – 13 September 1409) was Queen of England as the second spouse of King Richard II.
Her parents were King Charles VI of France and Isabeau of Bavaria.
She married the king at the age of six and was widowed three years later.
She later married Charles, Duke of Orléans, dying in childbirth at the age of nineteen.
Isabella's younger sister, Catherine, was Queen of England from 1420 until 1422, married to Henry V and mother of Henry VI.
Joan of Valois, Countess of Beaumont
Joan of Valois (1304–1363) was the daughter of Charles of Valois and his second wife Catherine I of Courtenay, titular empress of Constantinople.
Half sister to Philip VI of Valois, in around 1320 she married Robert III of Artois, Count of Beaumont-le-Roger and seigneur of Conches.
They had five known children:
Robert III of Artois had attempted to recover the title of count of Artois, which had been taken from him by his aunt Mahaut of Artois, but was condemned and exiled in 1331 for making and presenting forged documents in the process of filing against her.
Joan of Valois and their children were therefore imprisoned by order of her half-brother Philip VI.
Jean de Metz
Jean de Metz( also Jean de Nouillonpont)( born c. 1398) was a French nobleman who is known primarily for his role in the exploits of Joan of Arc.
Marie of Brittany, Lady of La Guerche
Marie of Brittany (18 February 1391 – 18 December 1446) was the Countess of Perche and Lady of La-Guerche from 1396 until 1414, and the Countess of Alençon from 1404 until 1414.
In 1414, Marie’s titles became Duchess of Alençon, Countess of Perche, Lady of La-Guerche, when Charles VI of France raised her husband John's county of Alençon to a duchy.
After the death of her husband in 1415, Marie retained the title of Lady of La-Guerche when her son, John II took the titles of Duke of Alençon and Count of Perche.
Marie was the link between the House of Montfort of the duchy of Brittany and the ducal House of Valois-Alençon.
Isabella of Valois, Duchess of Bourbon
Isabella of Valois, Duchess of Bourbon or" Isabella of France"( 1313 – 26 July 1383), was a Petit Fille of France, and a daughter of Charles of Valois by his third wife Mahaut of Châtillon.
She was the wife of Peter I, Duke of Bourbon.
René, Duke of Alençon
René of Alençon( 1454 – 1 November 1492, Chateau d' Alençon, age 37– 38), was the son of John II of Alençon and Marie of Armagnac.
Marie of Valois, Duchess of Calabria
Marie of Valois( 1309 – 23 October 1331), was the eldest daughter of Charles of Valois by his third wife Mahaut of Châtillon.
She was a member of the House of Valois.
One of her five children was Queen Joanna I of Naples.
Joan of Valois, Duchess of Alençon
Joan of Valois (13 September 1409, in Blois – 19 May 1432, in Angers) was the only surviving child of Charles, Duke of Orléans, and Isabella of Valois.
She held the title Duchess of Alençon when married to John II of Alençon.
Charles III, Count of Alençon
Charles III of Alençon( 1337 – 5 July 1375, Lyon) was the eldest son of Charles II of Alençon and Maria de la Cerda.
He succeeded his father as Count of Alençon in 1346, but resigned the county to his brother Peter II of Alençon in 1361 to take up an ecclesiastical career.
On 13 July 1365, he was made Archbishop of Lyon.
As archbishop, he firmly resisted royal encroachment on his rights as Primate of France.

Question: Who is Joan Of Valois, Duchess Of Alençon's maternal grandfather?
Answer: Charles VI of France