Beatrice of Navarre, Duchess of Burgundy
Beatrice of Navarre( 1242? – 1295), was Duchess of Burgundy, by marriage to Hugh IV, Duke of Burgundy.
She was a daughter of Theobald I of Navarre and his third wife Margaret of Bourbon.
Her siblings included Theobald II of Navarre and Henry I of Navarre.
She is also known as Beatrix of Champagne.
Isabella of Navarre, Viscountess of Rohan
Isabel d' Albret of Navarre( 1512–1555) was the daughter of John III of Navarre( died 1516) and Catherine I of Navarre, sister and heiress of Francis Phoebus, King of Navarre.
As heir apparent, her brother rose to the throne in 1517 as Henry II of Navarre, grandfather of King Henry III of Navarre( Henry IV of France).
Joan of Navarre (regent)
Joan of Navarre( 1382 – July 1413) was the heir presumptive to the throne of Navarre in 1402 – 1413, and regent of Navarre in the absence of her father in 1409 – 1411.
She was the eldest child of King Charles III of Navarre by his wife Eleanor, daughter of King Henry II of Castile.
Philip, Count of Longueville
Philip of Navarre, Count of Longueville( 1336 – 1363) was a younger brother and supporter of Charles II of Navarre, a claimant to the French throne.
The son of Philip III of Navarre and Joan II of Navarre, he married Yolande of Flanders in 1353.
She was the daughter of Robert of Flanders and Joan of Brittany( from the House of Capet) and the widow of Henry IV of Bar.
The marriage was childless, though by his mistress Jeannette d' Aisy Philip had two illegitimate children- Lancelot( who was granted Longueville as a gift in 1371 by his uncle Charles II of Navarre so long as he served in the company of the Duke of Brittany) and Robine( granted Longueville by her uncle Louis of Navarre in 1367).
Philip and his brother Charles fought against John II of France in 1353.
Joan II of Navarre
Joan II (28 January 1312 – 6 October 1349) was Queen of Navarre from 1328 until her death.
She was the only surviving child of Louis X of France, King of France and Navarre, and Margaret of Burgundy.
Joan's paternity was dubious because her mother was involved in a scandal, but Louis X declared her his legitimate daughter before he died in 1316.
However, the French lords were opposed to the idea of a female monarch and elected Louis X's brother, Philip V, king.
The Navarrese noblemen also paid homage to Philip.
Joan's maternal grandmother, Agnes of France, Duchess of Burgundy, and uncle, Odo IV of Burgundy, made attempts to secure the counties of Champagne and Brie (which had been the patrimony of Louis X's mother, Joan I of Navarre) to Joan, but the French royal troops defeated her supporters.
After Philip V married his daughter to Odo and granted him two counties as her dowry, Odo renounced Joan's claim to Champagne and Brie in exchange for a compensation in March 1318.
Joan married Philip of Évreux, who was also a member of the French royal family.
Philip V was succeeded by his brother, Charles IV, in both France and Navarre in 1322, but most Navarrese lords refused to swear loyalty to him.
After Charles IV died in 1328, the Navarrese expelled the French governor and declared Joan the rightful monarch of Navarre.
In France, Philip of Valois was crowned king.
He concluded an agreement with Joan and her husband, who renounced Joan's claims to Champagne and Brie in exchange for three counties, while Philip acknowledged their right to Navarre.
Joan and her husband were together crowned in Pamplona Cathedral on 5 March 1329.
The royal couple closely cooperated during their joint reign, but Philip of Évreux was more active.
However, they mostly lived in their French domains.
Navarre was then administered by governors during their absence.
Beatrice of Navarre, Countess of La Marche
Beatrice of Navarre( 1392-1412/1415) was a daughter of Charles III of Navarre and his wife, Eleanor of Castile.
Charles II of Navarre
Charles II (10 October 1332 – 1 January 1387), called Charles the Bad, was King of Navarre 1349–1387 and Count of Évreux 1343–1387.
Besides the Pyrenean Kingdom of Navarre, he had extensive lands in Normandy, inherited from his father, Count Philip of Évreux, and his mother, Queen Joan II of Navarre, who had received them as compensation for resigning her claims to France, Champagne, and Brie in 1328.
Thus, in Northern France, Charles possessed Évreux, Mortain, parts of Vexin, and a portion of Cotentin.
He was a major player at a critical juncture in the Hundred Years' War between France and England, repeatedly switching sides in order to further his own agenda.
His horrific death by burning was widely considered God's justice upon him.
Isabella of France, Queen of Navarre
Isabella of France( 2 March 1241 – 17 April 1271) was a daughter of Louis IX of France and Margaret of Provence.
She was married to Theobald II of Navarre, eldest son of Theobald I of Navarre and Margaret of Navarre on 6 April 1255.
Isabelle became Queen consort of Navarre.
Joan of Valois, Queen of Navarre
Joan of France, also known as" Joan" or" Joanna of Valois"( 24 June 1343, Châteauneuf- sur- Loire – 3 November 1373, Évreux), was the daughter of John II of France( called" The Good"), and his first wife, Bonne of Luxembourg.
She married Charles II of Navarre( called" The Bad"), and became Queen- consort of Navarre.
Blanche of Navarre, Countess of Champagne
Blanche of Navarre( ?–1229) was countess and then regent of Champagne and finally also regent of her native kingdom of Navarre.
She was the youngest daughter of Sancho VI of Navarre and Sancha of Castile, who died in 1179, about two years after Blanche's birth.
Her eldest brother, Sancho VII of Navarre, succeeded their father as King of Navarre and was the last male descendant of the first dynasty of Kings of Navarre, the Pamplona dynasty, dying childless.
Her elder sister Berengaria of Navarre married Richard I of England.

Question: Who is Charles Ii Of Navarre's maternal grandfather?
Answer: Louis X of France