Margaret of Valois, Countess of Blois
Margaret of Valois( 1295–1342) was a French noblewoman.
She was a daughter of Charles, Count of Valois, and his first wife, Margaret, Countess of Anjou.
She was also a sister of King Philip VI of France.
In 1310, she married Guy I, Count of Blois.
They had three children together:
Charles I, Count of Nevers
Charles I, Count of Nevers( 1414 – 25 May 1464), Count of Nevers and Rethel, was the son of Philip II, Count of Nevers, and Bonne of Artois.
Towards the end of the life of Philip III, Duke of Burgundy, Charles fell under suspicion of practising witchcraft, in an effort to supplant Charles, Count of Charolais, as the heir.
Charles I fled to France and died soon after.
He married Marie d' Albret, daughter of Charles II d' Albret on 11 June 1456, but had no legitimate children.
He was succeeded by his brother John.
Hugh I, Count of Maine
Hugh I was count of Maine( 900–933).
He succeeded his father as of Count of Maine.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Yolande of Aragon
Yolande of Aragon (11 August 1384 – 14 November 1442) was a throne claimant and titular queen regnant of Aragon, titular queen consort of Naples, Duchess of Anjou, Countess of Provence, and regent of Provence during the minority of her son.
She was a daughter of John I of Aragon and his wife Yolande of Bar (daughter of Robert I, Duke of Bar, and Marie of Valois).
Yolande played a crucial role in the struggles between France and England, influencing events such as the financing of Joan of Arc's army in 1429 that helped tip the balance in favour of the French.
She was also known as Yolanda de Aragón and Violant d'Aragó.
Tradition holds that she commissioned the famous Rohan Hours.
Hugh V, Count of Maine
Hugh V was the Count of Maine from 1069 until 1072.
Charles II, Count of Hohenzollern-Sigmaringen
Charles II, Count of Hohenzollern-Sigmaringen "(German: Karl II, Graf von Hohenzollern-Sigmaringen)" (1547 – 8 April 1606) became Count of Hohenzollern-Sigmaringen in 1576 and remained so until his death.
He was the fifth but second surviving son of Charles I, Count of Hohenzollern and Anna, daughter of Ernest, Margrave of Baden-Durlach.
Hugh II, Count of Maine
Hugh II( 920- before 992), Count of Maine, son of Hugh I, Count of Maine, and an unknown mother, probably a daughter of Gauzlin II, Count of Maine.
He was, like his father, a vassal of his uncle Hugh the Great.
After the death of Hugh the Great, Hugh II allied himself Fulk II the Good, Count of Anjou, and Theobald the Trickster, Count of Blois.
Hugh later joined Theobald ’s son Odo against Seinfroy, Bishop of Le Mans.
Hugh and Odo had to flee and seek refuge with Bouchard I, Count of Vendôme, in the areas that form the Bas- Vendômois.
In 939 he fought alongside Alan II, Duke of Brittany and Judicael Berengar against the Vikings at the Battle of Trans- la- Forêt.
Hugh had by his unknown wife: Hugh III, Count of Maine, Fulk of Maine,( d. after 992) and Herbert “ Baco ” of Maine( d. after 1046), regent of Hugh IV, Count of Maine.
Hugh was succeeded as Count of Maine by his son Hugh III.
Charles, Count of Maine
Charles du Maine (1414–1472) was a French prince of blood and an advisor to Charles VII of France, his brother-in-law, during the Hundred Years' War.
He was the third son of Louis II, Duke of Anjou and King of Naples, and Yolande of Aragon.
In 1434, he married Cobella Ruffo (d. 1442), Countess of Montalto and Corigliano.
They had one son, named Jean Louis Marin, who died as an infant.
In 1437, he took up arms on behalf of King Charles VII of France, participating in the capture of Montereau, and that of Pontoise, in 1441.
At this time, his brother, René of Anjou, ceded to him the County of Maine.
He continued to take part in King Charles' campaigns.
By his second marriage, in 1443, to Isabelle of Luxembourg (d. 1472), daughter of Peter I of Luxembourg, Count of Saint-Pol, he had two children:
A dispute over the county of Guise between Charles and Isabelle's brother, Louis of Luxembourg, Count of Saint-Pol, was settled by settling it upon Isabelle as a dowry.
Charles also had an illegitimate daughter, Mary of Anjou, who married Thomas Courtenay, 6th Earl of Devon.
He led the rearguard for King Louis XI of France at the Battle of Montlhéry.
Elias I, Count of Maine
Elias I( also" Hélie" or" Élie")( died 11 July 1110), called de la Flèche or de Baugency, was the Count of Maine, succeeding his cousin Hugh V, Count of Maine.

Question: Who is Charles, Count Of Maine's maternal grandfather?
Answer: John I of Aragon