Joan Holland, Duchess of Brittany
Lady Joan Holland (1350 – October 1384) was Duchess of Brittany as the second wife of John IV, Duke of Brittany.
She was the daughter of Joan of Kent and Thomas Holland, 1st Earl of Kent.
Her mother married secondly to Edward the Black Prince and was mother to Richard II.
Her marriage to John IV took place in London in May 1366, but without the approval of King Edward III of England, Joan's step-grandfather, who claimed overlordship of Brittany.
The couple had no children.
Joan's death, in her thirties, was politically inexpedient.
In 1386, two years afterwards, John IV married Joan of Navarre, later the queen of King Henry VI of England.
Isabeau of Bavaria
Isabeau of Bavaria (or Isabelle; also Elisabeth of Bavaria-Ingolstadt; c. 1370 – 24 September 1435) was queen of France between 1385 and 1422.
She was born into the House of Wittelsbach as the eldest daughter of Duke Stephen III of Bavaria-Ingolstadt and Taddea Visconti of Milan.
At age 15 or 16, Isabeau was sent to the young King Charles VI of France; the couple wed three days after their first meeting.
Isabeau was honored in 1389 with a lavish coronation ceremony and entry into Paris.
In 1392 Charles suffered the first attack of what was to become a lifelong and progressive mental illness, resulting in periodic withdrawal from government.
The episodes occurred with increasing frequency, leaving a court both divided by political factions and steeped in social extravagances.
A 1393 masque for one of Isabeau's ladies-in-waiting—an event later known as "Bal des Ardents"—ended in disaster with the King almost burning to death.
Although the King demanded Isabeau's removal from his presence during his illness, he consistently allowed her to act on his behalf.
In this way she became regent to the Dauphin of France (heir apparent), and sat on the regency council, allowing far more power than was usual for a medieval queen.
Charles' illness created a power vacuum that eventually led to the Armagnac–Burgundian Civil War between supporters of his brother, Duke Louis I of Orléans, and the royal dukes of Burgundy.
Isabeau shifted allegiances as she chose the most favorable paths for the heir to the throne.
When she followed the Armagnacs, the Burgundians accused her of adultery with Louis of Orléans; when she sided with the Burgundians the Armagnacs removed her from Paris and she was imprisoned.
In 1407 John the Fearless assassinated Orléans, sparking hostilities between the factions.
The war ended soon after Isabeau's eldest son, Charles, had John the Fearless assassinated in 1419—an act that saw him disinherited.
Isabeau attended the 1420 signing of the Treaty of Troyes, which decided that the English king should inherit the French crown after the death of her husband, Charles VI.
She lived in English-occupied Paris until her death in 1435.
Isabeau was popularly seen as a spendthrift and irresponsible philanderess.
In the late 20th and early 21st centuries historians re-examined the extensive chronicles of her lifetime, concluding that many elements of her reputation were unearned and stemmed from factionalism and propaganda.
Joan of France, Duchess of Brittany
Joan of France (24 January 1391 – 27 September 1433) was Duchess of Brittany by marriage to
John V. She was a daughter of Charles VI of France and Isabeau of Bavaria.
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.
Claude of France
Claude of France( 13 October 1499 – 20 July 1524) was a queen consort of France by marriage to Francis I.
She was also ruling Duchess of Brittany from 1514.
She was a daughter of the French king Louis XII of France and Anne of Brittany.
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.
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.
Isabella of Brittany
Isabella of Brittany( 1411 – c. 1444) was a daughter of John V, Duke of Brittany, and his wife, Joan of Valois.
Isabella was a member of the House of Dreux.
Margaret of France, Duchess of Berry
Margaret of France, Duchess of Berry (French: "Marguerite de Valois")
(5 June 1523 – 15 September 1574) was the daughter of King Francis I of France and Claude, Duchess of Brittany.
Louisa Montagu Douglas Scott, Duchess of Buccleuch
Louisa Jane Montagu Douglas Scott, Duchess of Buccleuch and Queensberry( 26 August 1836 – 16 March 1912) was the daughter of James Hamilton, 1st Duke of Abercorn.
In 1884, she became the Duchess of Buccleuch and Duchess of Queensberry, the wife of William Henry Walter Montagu Douglas Scott, 6th Duke of Buccleuch& 8th Duke of Queensberry.
She was the paternal grandmother of Princess Alice, Duchess of Gloucester and of Marian Louisa, Lady Elmhirst, as well as the maternal great- grandmother of Prince William of Gloucester, Prince Richard, Duke of Gloucester and great- great- grandmother of Sarah, Duchess of York.

Question: Who is Joan Of France, Duchess Of Brittany's maternal grandmother?
Answer: Taddea Visconti