Charles of Artois, Count of Eu
Charles of Artois( 1394 – 25 July 1472), son of Philip of Artois, Count of Eu and Marie of Berry, was Count of Eu from December 1397 until his death 74 years later.
He was taken prisoner by the English at the Battle of Agincourt on 25 October 1415, and was not released until 1438.
In 1448, he married Jeanne of Saveuse( died 1449) and on 23 September 1454, Helene of Melun( d. 1473), but he had no children.
He was appointed Lieutenant of the King in Normandy and Guyenne, as well as Governor of Paris, during the War of the Public Weal in 1465.
He was succeeded by his nephew John II, Count of Nevers.
John of Artois, Count of Eu
John of Artois (29 August 1321 – 1387), called "sans Terre" (Lackland), was the son of Robert III of Artois and Joan of Valois.
The confiscation of his father's goods for attempted fraud in 1331 had left him without an inheritance.
In 1352, he was created Count of Eu, a title earlier forfeited at the execution of the previous holder, Raoul II of Brienne.
He was badly wounded at the Battle of Poitiers on 19 September 1356, and was captured there by the English.
Enormously rich his ransom was sold to the Black Prince by his captor Élie de Pommiers for 30,000 old écus.
He married Isabeau of Melun (1328–1389), daughter of John I of Melun, Count of Tancarville, on 11 July 1352 and had the following issue:
Louis, Count of Évreux
Louis of Évreux( 3 May 1276 – 19 May 1319, Paris) was a prince, the only son of King Philip III of France and his second wife Maria of Brabant, and thus a half- brother of King Philip IV of France.
Louis had a quiet and reflective personality and was politically opposed to the scheming of his half- brother Charles of Valois.
He was, however, close with his nephew Philip V of France.
He married Margaret of Artois, daughter of Philip of Artois and sister of Robert III of Artois, and had five children:
William II, Count of Eu
William II, Count of Eu, feudal baron of Hastings( d. circa 1095) was a first generation Anglo- Norman nobleman, Count of Eu and rebel.
Philip II, Count of Nevers
Phillip II, Count of Nevers( October 1389, Villaines- en- Duesmois – 25 October 1415, Agincourt) was the youngest son of Philip the Bold and Margaret III of Flanders.
He succeeded his brothers, John the Fearless and Anthony, Duke of Brabant, as Count of Nevers and Rethel respectively after each of them acceded to their duchies.
He married in Soissons, on 9 April 1409, Isabelle de Coucy( d. 1411), daughter of Enguerrand VII de Coucy and Isabelle of Lorraine.
They had two children:
He married again, in Beaumont- en- Artois on 20 June 1413, Bonne of Artois, daughter of Philip of Artois, Count of Eu.
They had two sons:
He also had four illegitimate children by various mistresses.
In spite of his elder brother John's ambivalent position and ultimate refusal to come to the aid of the royal army in the face of the English invasion of Henry V in 1415, Philip was with the French army at the Battle of Agincourt, and both he and his brother Anthony were killed in the battle.
He was succeeded by his son Charles.
Robert IV of Artois, Count of Eu
Robert IV of Artois( 1356 – July 20, 1387), son of John of Artois, Count of Eu and Isabeau of Melun, was Count of Eu from April to July 1387.
About 1376, he married Joanna of Durazzo, daughter of Charles, Duke of Durazzo.
Robert IV inherited the County of Eu on April 6, 1387 along with Saint- Valery and Ault, however, in Naples at the time, he never learned of his father's death.
He and his wife were poisoned whilst staying at Castel dell' Ovo on July 20, 1387 on the orders of Joanna's own sister Margaret, Queen Regent of Naples.
Robert and Joanna were buried in the church of San Lorenzo Maggiore in Naples.
The marriage of Robert and Joanna had remained childless.
Robert was succeeded in Eu by his younger brother Philip of Artois, Count of Eu.
Philip of Artois
Philip of Artois( 1269 – 11 September 1298) was the son of Robert II of Artois, Count of Artois, and Amicie de Courtenay.
He was the Lord of Conches, Nonancourt, and Domfront.
He married Blanche of Brittany, daughter of John II, Duke of Brittany, and had the following children:
He served under his father at the Battle of Furnes, where he was wounded.
He never recovered, and died of the effects over a year later.
He was buried in the now- demolished church of the Couvent des Jacobins in Paris.
His premature death led to a legal battle later, when Artois was left to his sister Mahaut rather than his son Robert.
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.
Margaret of Artois
Margaret of Artois( 1285–1311) was the eldest child of Philip of Artois and his wife, Blanche of Brittany.
She was a member of the House of Artois.
She was married to Louis d'Évreux.
By her marriage, Margaret was Countess consort of Évreux.
Philip of Artois, Count of Eu
Philip of Artois (1358 – 16 June 1397, Micalizo), son of John of Artois, Count of Eu, and Isabeau of Melun, was Count of Eu from 1387 until his death, succeeding his brother Robert.
Philip was a gallant and energetic soldier.
In 1383, he captured the town of Bourbourg from the English.
He went on a pilgrimage to the Holy Land, and was imprisoned there by Barquq, the Sultan of Egypt, being released through the mediation of Jean Boucicaut and the Venetians.
In 1390, he joined the unsuccessful expedition of Louis II, Duke of Bourbon, against Mahdia.
In 1392, he was created Constable of France.
On 27 January 1393 he married Marie (1367–1434), daughter of John, Duke of Berry.
They had four children:
As a prominent Crusader, he was one of the French contingent sent to take part in the Battle of Nicopolis.
He was captured in the battle, and subsequently died in captivity.

Question: Who is Philip Of Artois, Count Of Eu's paternal grandfather?
Answer: Robert III of Artois