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.
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.
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.
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.
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.
Violante Visconti
Violante (Jolantha) Visconti (1354 – November 1386) was the second of three children of Galeazzo II Visconti, Lord of Milan and Pavia, and Bianca of Savoy.
Her father gave to her the provinces of Alba, Mondovì, Kenites, Cherasco, and Demonte as an inheritance.
As a 13-year-old, with the promise of a large dowry from her father, in addition to her territories, she was married to the third son of King Edward III of England, Lionel of Antwerp, 1st Duke of Clarence, in the church of Santa Maria Maggiore, predecessor of the Cathedral of Santa Maria Nascente, Milan, on 28 May 1368.
The wedding festivities were lavish and ostentatious.
The banquet, held outside, included 30 courses of meat and fish presented fully gilded.
Between the courses the guests were given gifts such as suits of armor, bolts of cloth, war horses, arms, and hunting dogs.
Among the guests were Geoffrey Chaucer, Petrarch, Jean Froissart and John Hawkwood.
The marriage was short-lived.
Lionel died in Alba on 17 October that year, just five months after the wedding.
His death may have been due to food poisoning.
The Duchess of Clarence had no issue by the Duke.
On 2 August 1377, Violante's father negotiated a second marriage, to Secondotto, Marquess of Montferrat.
Sixteen months later, on 16 December 1378, Secondotto was assassinated after a battle at Piacenza (or Asti).
They had no issue.
On 18 April 1381, she married a third time to her cousin Ludovico Visconti, lord governor of Lodi and Parma.
He was the son of her paternal uncle Bernabò Visconti and his wife, Beatrice Regina della Scala.
They had a son, Giovanni Visconti, who was born after 1382.
Barbara Tuchman suggests that her brother may have killed her third husband.
Violante died in Pavia in November 1386, at the age of 32.
Hüma Hatun
Hüma Hatun (1410 ‒ September 1449) was the fourth wife of Ottoman Sultan Murad II and mother of Mehmed II and the grandmother of Bayezid II.
Bianca of Savoy
Bianca of Savoy (1337– Pavia, 31 December 1387) was Lady of Milan by marriage to Galeazzo II Visconti.
She was the only surviving daughter of Aimone, Count of Savoy and Yolande Palaeologina of Montferrat.

Question: Who is Violante Visconti's maternal grandmother?