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.
Louis I, Duke of Orléans
Louis I of Orléans (13 March 1372 – 23 November 1407) was Duke of Orléans from 1392 to his death.
He was also, Duke of Touraine (1386–1392), Count of Valois (1386?–1406)
Blois (1397–1407), Angoulême (1404–1407), Périgord (1400–1407) and Soissons (1404–07).
Louis was the second son of King Charles V of France and Joanna of Bourbon and was the younger brother of Charles VI.
In 1498, his heirs male inherited the French throne after the extinction of the Valois main line.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
Margaret, Countess of Vertus
Margaret, Countess of Vertus (French: "Marguerite d'Orléans"; 4 December 1406 – 1466), was a French vassal, Countess of Vertus and Etampes 1420–1466.
She was the daughter of Louis I, Duke of Orléans, and Valentina Visconti.
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.
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.
Valentina Visconti, Duchess of Orléans
Valentina Visconti (1371 – 4 December 1408) was a Sovereign Countess of Vertus, and Duchess consort of Orléans as the wife of Louis de Valois, Duke of Orléans, the younger brother of King Charles VI of France.

Question: Who is the paternal grandmother of Margaret, Countess Of Vertus?
Answer: Joanna of Bourbon