Question: Who is the paternal grandmother of John Ii, Marquis Of Namur?

Knowledge 1: John II, Marquis of Namur
John II of Namur, (1311 – 2 April 1335), was Marquis of Namur from 1330 to 1335.He was the eldest son of John I, Marquis of Namur, and Mary of Artois.He succeeded his father on 26 January 1330.He joined an alliance against John III, Duke of Brabant, but by the intervention of King Philip VI of France, a conflict was averted.He died unmarried, but had an illegitimate son Philip, who was killed in 1380, while defending Dendermonde.<br>He was succeeded by his brother Guy. [SEP] Knowledge 2: John I, Marquis of Namur
John I of Namur (1267 – 31 January 1330) was the ruler of Namur from 1305 to 1330.He was a member of the House of Dampierre, the son of Guy of Dampierre, Count of Flanders and Marquis of Namur, and his second wife Isabelle of Luxembourg.John was the father of Blanche of Namur, Queen of Sweden and Norway.He was the elder brother of Guy of Namur, whom he sent to command the Flemish rebels against the French Kingdom in the 1302 Battle of the Golden Spurs.
Knowledge 1: William II, Marquis of Namur
William II, Marquis of Namur( 22 January1355 – 10 January 1418) inherited the Marquisate of Namur from his father William I in 1391 and held it until his own death.His mother was Catherine of Savoy( † 1388), daughter of Louis II of Savoy, baron of Vaud, and Isabella of Châlon.His rule as marquis of Namur was a peaceful one, in which he devoted himself to encouraging commerce, industry and the building of fortifications.He did participate in 1408 in the suppression of a revolt by the people of Liège, together with John the Fearless, Duke of Burgundy, William IV, Count of Hainaut and Louis VII, Duke of Bavaria.His first wife was Marie de Bar, daughter of Robert I, Duke of Bar and Marie of Valois( 1344- 1404).< br>In 1393, he remarried with Jeanne d' Harcourt( 1372 – 1456), daughter of John VI, Count of Harcourt and Catherine of Bourbon.< br>He had no surviving children and so on his death William II was succeeded as Marquis by his brother John III. [SEP] Knowledge 2: John III, Marquis of Namur
John III( died 10 March 1429) was between 1418 and 1429 the last independent Marquis of Namur.He was the youngest son of William I, Marquis of Namur and Catherine of Savoy( † 1388), daughter of Louis II of Savoy, baron of Vaud, and Isabella of Châlon.< br>When his father died in 1391, he inherited Wijnendale and Ronse.He succeeded his elder brother William II as Marquis of Namur, when William died without children in 1418.John never married, but had an illegitimate son with his cousin Cécile of Savoy: Philip of Namur, seigneur de Dhuy( died 1449).John III lead a very luxurious life, and he had to raise taxes to finance his expenses.This led to revolts and high debts, which forced John to sell his County to Philip the Good, Duke of Burgundy( 23 April 1421) for 30.000 golden crowns and the clause that he could benefit from the usufruct of his former county.Philip the Good incorporated Namur into the Burgundian Netherlands, thus ending the existence of an independent County of Namur.
Knowledge 1: William II, Marquis of Namur
William II, Marquis of Namur( 22 January1355 – 10 January 1418) inherited the Marquisate of Namur from his father William I in 1391 and held it until his own death.His mother was Catherine of Savoy( † 1388), daughter of Louis II of Savoy, baron of Vaud, and Isabella of Châlon.His rule as marquis of Namur was a peaceful one, in which he devoted himself to encouraging commerce, industry and the building of fortifications.He did participate in 1408 in the suppression of a revolt by the people of Liège, together with John the Fearless, Duke of Burgundy, William IV, Count of Hainaut and Louis VII, Duke of Bavaria.His first wife was Marie de Bar, daughter of Robert I, Duke of Bar and Marie of Valois( 1344- 1404).< br>In 1393, he remarried with Jeanne d' Harcourt( 1372 – 1456), daughter of John VI, Count of Harcourt and Catherine of Bourbon.< br>He had no surviving children and so on his death William II was succeeded as Marquis by his brother John III. [SEP] Knowledge 2: William I, Marquis of Namur
William I, Marquis of Namur," the Rich",( 1324 – 1 October 1391) was Count of Namur from 1337 until his death.

Answer: Isabelle of Luxembourg