Anne Denman
Anne Denman( 1587–1661) was born in Olde Hall, Retford, Nottinghamshire.
Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Kaoru Hatoyama
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
Marie of Artois
Marie of Artois (French: Marie d'Artois, Dutch: Maria van Artesië.)
Born in 1291, was the fourth daughter of Philip of Artois and Blanche of Brittany.
She became the Lady of Méraude (Merode) when she purchased it from John the Blind, King of Bohemia, in 1342.
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.
Gülbahar Hatun (wife of Mehmed II)
Gülbahar Hatun( 1432 – 1492) was the consort of Sultan Mehmed II, and mother of Sultan Bayezid II of the Ottoman Empire and the grandmother of Selim I.
Mona Hopton Bell
Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.
She was the grandmother of the painter Jean H. Bell.
Marie de Namur
Marie of Namur, also known as Marie de Namur or Maria van Dampierre.
Her titles were "Gräfin von Vianden", from her first marriage and "Dame de Pierrepont", from her second marriage to, Theobald of Bar.
Born in 1322 to John I of Namur and his wife Marie of Artois.
She had three sisters, including Blanche of Namur, Queen consort of Sweden and Norway, and seven brothers.
In 1335/36, she married her first husband, Henry II, Graf of Vianden, son of Philip II, Graf of Vianden and his first wife Lucia von der Neuerburg.
Henry was murdered at Famagusta in September 1337.
In c. 1337, she gave birth to Maria of Vianden her first daughter from her marriage to Henry II, Graf of Vianden.
Her second marriage in 1340 (dispensation 9 September 1342) was to her father's second cousin, Theobald of Bar, Seigneur de Pierrepont, son of Erard of Bar, Seigneur de Pierrepont
et d'Ancerville (himself son of Theobald II of Bar), and his wife Isabelle of Lorraine (daughter of Theobald II, Duke of Lorraine).
This marriage produced two daughters, Yolande de Bar (b. c 1343 – d. c 1410) and Elisabeth de Bar (b. c
1345 – d. before 11 May 1411).
Marie died somewhere before 29 October 1353/57.

Question: Who is the maternal grandmother of Marie De Namur?
Answer: Blanche of Brittany