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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Eleanor of Brittany (abbess)
Eleanor of Brittany (1275 – 16 May 1342) was the sixteenth abbess of Fontevrault.
She was born in England to John II, Duke of Brittany and Beatrice of England, and in 1281 at the age of seven entered Amesbury Abbey, a priory of the Fontevrault order (her first cousin, twice removed, Eleanor, Fair Maid of Brittany is buried there).
In 1290 she moved to Fontevrault Abbey in the Loire region of France, the parent abbey of the order, where she took her vows and became a nun.
The richly illuminated Fontevraud Gradual was presented to her upon her induction.
In 1304 she became abbess.
Upon her death in 1342 she bequeathed the gradual to the abbey.
It survives to this day and is held by the public library of Limoges.
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.
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.
Blanche of Brittany
Blanche of Brittany( 1271 – 1327) was a daughter of John II, Duke of Brittany, and his wife Beatrice of England.
She is also known as Blanche de Dreux.
Through her mother she was the granddaughter of King Henry III of England and Eleanor of Provence.
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.
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.
Beatrice of England
Beatrice of England (25 June 1242 – 24 March 1275) was a member of the House of Plantagenet, the daughter of Henry III of England and Eleanor of Provence.

Question: Who is the maternal grandmother of Eleanor Of Brittany (Abbess)?
Answer: Eleanor of Provence