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.
Diana Guardato
Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan Carlos
I of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others.
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.
Purnima (Hindi actress)
Purnima Das Verma( born Meherbhano Mohammad Ali) was an Indian film actress who worked predominantly in Hindi language films.
She is the grandmother of actor Emraan Hashmi.
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.
Adosinda
Adosinda was the queen of Asturias during the reign of her husband, Silo, from 774 to 783.
She was a daughter of Alfonso I and Ermesinda, daughter of the first Asturian king, Pelayo.
She was a sister of Fruela I.
Her husband probably succeeded in becoming King because he was related by marriage to both of the previous ruling families.
Some scholars have even posited a matrilineal succession.
Since she gave Silo no heir, her nephew Alfonso II was proclaimed king upon his death.
He was expelled from the realm by Mauregatus, and on 26th November 783, Adosinda was put in the monastery of San Juan de Pravia, where she lived out the rest of her life.
Ermesinda
Ermesinda (c. 720 or c. 730 — ?)
alternatively Ormisenda, Ermisenda, Ermesinde, Ermessenda) was queen consort of the Kingdom of Asturias, wife of King Alfonso I of Asturias ("Alfonso the Catholic").
She was the daughter of King Pelagius of Asturias and his queen, Gaudiosa.
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.
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.

Question: Who is Adosinda's maternal grandmother?
Answer: Gaudiosa