Question: Who is Blanche Of Navarre, Queen Of France's maternal grandfather?

Context paragraphs:
title: Blanche of Navarre, Countess of Champagne
paragraph_text: 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.
title: Blanche of France, Infanta of Castile
paragraph_text: Blanche of France( French:" Blanche de France")( 1253–1323) was a daughter of King Louis IX of France and Margaret of Provence, and sister of King Philip III of France and Queen Isabella of Navarre.
title: Blanche II of Navarre
paragraph_text: Blanche II( 9 June 1424 – 2 December 1464), titular queen of Navarre, was the daughter of John II of Aragon and Blanche I of Navarre. She was also Princess of Asturias by marriage.
title: Blanche of Navarre, Queen of France
paragraph_text: Blanche of Navarre (1330 – 5 October 1398) was Queen of France as the wife of King Philip VI. She was the second child and daughter of Queen Joan II of Navarre and King Philip III of Navarre. She belonged to the House of Évreux, a cadet branch of the House of Capet, and married into the House of Valois, another cadet branch of the House of Capet.
title: René I, Viscount of Rohan
paragraph_text: René I de Rohan,( 1516–1552) 18th Viscount of Rohan, Viscount and Prince de Léon, and Marquis de Blain married Isabella of Navarre daughter of jure uxoris King John III of Navarre and Catherine of Navarre, Queen of Navarre.
title: Charles, Prince of Viana
paragraph_text: Charles, Prince of Viana( 29 May 1421 – 23 September 1461), sometimes called Charles IV of Navarre, was the son of King John II of Aragon and Queen Blanche I of Navarre.
title: Isabella of Navarre, Viscountess of Rohan
paragraph_text: 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).
title: Joan II of Navarre
paragraph_text: 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.
title: Joan I of Navarre
paragraph_text: Joan I (14 January 1273 – 31 March/2 April 1305)  was queen regnant of Navarre and countess of Champagne from 1274 until 1305; she was also queen consort of France by marriage to Philip IV of France. She was the daughter of king Henry I of Navarre and Blanche of Artois.
title: Isabella of France, Queen of Navarre
paragraph_text: 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.

Reasoning steps:
Blanche of Navarre, Queen of France mother Joan II of Navarre
Joan II of Navarre father Louis X of France

Answer: spans: Louis X of France