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.
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.
Princess Kira of Prussia
Princess Kira of Prussia
(Kira Auguste Viktoria Friederike; 27 June 1943 – 10 January 2004) was the fourth child and second daughter of Louis Ferdinand, Prince of Prussia and Grand Duchess Kira Kirillovna of Russia.
Princess Kira was born in Cadienen, East Prussia (today Kadyny, Poland).
She married Thomas Frank Liepsner on 10 September 1973 in a civil ceremony.
The religious ceremony was held the next day at Felizenweil.
They were divorced in 1984.
They had one daughter, Kira-Marina Liepsner (born 22 January 1977), who married Andreas Felix Paul von Bismarck (born 31 January 1979) on 7 May 2005 in St. Peter und Paul Church on Nikolskoë, Berlin.
She died in Berlin after a long illness.
Her urn was buried in Hohenzollern Castle.
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.
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.
Grand Duchess Kira Kirillovna of Russia
Grand Duchess Kira Kirillovna of Russia (9 May 1909 – 8 September 1967) was the second daughter of Grand Duke Kirill Vladimirovich of Russia and Princess Victoria Melita of Saxe-Coburg and Gotha.
She married the head of the German Imperial House, Prince Louis Ferdinand of Prussia.
Princess Charlotte of Prussia (1831–1855)
Princess Charlotte of Prussia( 21 June 1831 – 30 March 1855), was by birth a Princess of Prussia and member of the House of Hohenzollern and by marriage Hereditary Princess of Saxe- Meiningen.
She was the eldest child and daughter of Prince Albert of Prussia( younger son of Frederick William III of Prussia and Louise of Mecklenburg- Strelitz) and his first wife Princess Marianne of the Netherlands( daughter of William I of the Netherlands and Wilhelmine of Prussia).
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.

Question: Who is Princess Kira Of Prussia's maternal grandmother?
Answer: Princess Victoria Melita of Saxe-Coburg and Gotha