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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Margaret of Bar
Margaret of Bar (1220–1275) was a daughter of Henry II of Bar and his wife Philippa of Dreux.
She was Countess of Luxembourg by her marriage to Henry V of Luxembourg.
She is also known as "Marguerite of Bar".
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.
Philippa of Dreux
Philippa of Dreux, Dame de Coucy (1192–1242) was a daughter of Robert II of Dreux and his second wife Yolande de Coucy.
Joan of Bar, Countess of Surrey
Joan of Bar( died 1361) was a French- English noble.
She acted as regent of the County of Bar from 1344 until 1353.
She was a daughter of Henry III, Count of Bar and Eleanor of England, and niece of Edward II of England.
She was unhappily married to John de Warenne, 7th Earl of Surrey.
In 1345, Joan became the regent of Bar for her great- nephew Robert.
Edward II, Count of Bar
Edward II of Bar( 1339 – May 1352) was Henry IV of Bar's eldest son and successor as count of Bar( with Edward's mother Yolande of Flanders ruling as count during his minority, which ended on 10 October 1349).
He had no male issue and was succeeded as count by his younger brother Robert I of Bar.
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.
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.
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.

Question: Who is the maternal grandmother of Margaret Of Bar?
Answer: Yolande de Coucy