Question: Who is Louis X Of France's maternal grandfather?

Knowledge 1: Louis X of France
Louis X (4 October 1289 – 5 June 1316), called the Quarrelsome, the Headstrong, or the Stubborn , was King of France from 1314 to 1316, succeeding his father Philip IV.After the death of his mother, Joan I of Navarre, he was also King of Navarre as LouisI  from 1305 until his death in 1316.His short reign in France was marked by tensions with the nobility, due to fiscal and centralization reforms initiated by Enguerrand de Marigny, the Grand Chamberlain of France, under the reign of his father.Louis' uncle—Charles of Valois, leader of the feudalist party—managed to convince the king to execute Enguerrand de Marigny.Louis allowed serfs to buy their freedom (which was the first step towards the abolition of serfdom), abolished slavery, and readmitted French Jews into the kingdom.In 1305, Louis had married Margaret of Burgundy, with whom he had Joan II of Navarre.Margaret was later convicted of adultery and died in prison, possibly murdered by strangulation.In 1315, Louis married Clementia of Hungary, who gave birth to John I of France a few months after the king's death.John's untimely death led to a disputed succession. [SEP] Knowledge 2: Joan I of Navarre
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.
Knowledge 1: Louis X of France
Louis X (4 October 1289 – 5 June 1316), called the Quarrelsome, the Headstrong, or the Stubborn , was King of France from 1314 to 1316, succeeding his father Philip IV.After the death of his mother, Joan I of Navarre, he was also King of Navarre as LouisI  from 1305 until his death in 1316.His short reign in France was marked by tensions with the nobility, due to fiscal and centralization reforms initiated by Enguerrand de Marigny, the Grand Chamberlain of France, under the reign of his father.Louis' uncle—Charles of Valois, leader of the feudalist party—managed to convince the king to execute Enguerrand de Marigny.Louis allowed serfs to buy their freedom (which was the first step towards the abolition of serfdom), abolished slavery, and readmitted French Jews into the kingdom.In 1305, Louis had married Margaret of Burgundy, with whom he had Joan II of Navarre.Margaret was later convicted of adultery and died in prison, possibly murdered by strangulation.In 1315, Louis married Clementia of Hungary, who gave birth to John I of France a few months after the king's death.John's untimely death led to a disputed succession. [SEP] Knowledge 2: Catherine of France, Countess of Montpensier
Catherine of France (4 February 1378 – November 1388) was the youngest child of Charles V of France and Joanna of Bourbon, who were cousins.She was a sibling of Charles VI of France and Louis of Valois, Duke of Orléans.
Knowledge 1: Louis X of France
Louis X (4 October 1289 – 5 June 1316), called the Quarrelsome, the Headstrong, or the Stubborn , was King of France from 1314 to 1316, succeeding his father Philip IV.After the death of his mother, Joan I of Navarre, he was also King of Navarre as LouisI  from 1305 until his death in 1316.His short reign in France was marked by tensions with the nobility, due to fiscal and centralization reforms initiated by Enguerrand de Marigny, the Grand Chamberlain of France, under the reign of his father.Louis' uncle—Charles of Valois, leader of the feudalist party—managed to convince the king to execute Enguerrand de Marigny.Louis allowed serfs to buy their freedom (which was the first step towards the abolition of serfdom), abolished slavery, and readmitted French Jews into the kingdom.In 1305, Louis had married Margaret of Burgundy, with whom he had Joan II of Navarre.Margaret was later convicted of adultery and died in prison, possibly murdered by strangulation.In 1315, Louis married Clementia of Hungary, who gave birth to John I of France a few months after the king's death.John's untimely death led to a disputed succession. [SEP] Knowledge 2: Louis, Grand Dauphin
Louis of France (1 November 1661 – 14 April 1711) was the eldest son and heir of Louis XIV, King of France, and his spouse, Maria Theresa of Spain.As the heir apparent to the French throne, he was styled Dauphin.He became known as Le Grand Dauphin after the birth of his own son, "Le Petit Dauphin".As he died before his father, he never became king.His grandson became Louis XV of France.

Answer: Henry I of Navarre