Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
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.
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.
Margravine Louise Charlotte of Brandenburg
Louise Charlotte of Brandenburg (13 September 1617 – 28 August 1676), was a Duchess consort of Courland by marriage to Duke Jacob Kettler of Courland.
She was the de facto ruler of Courland during the reign of her spouse.
She was born to George William, Elector of Brandenburg and Elizabeth Charlotte of the Palatinate (1597–1660).
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.
Alexander of Courland
Alexander of Courland  (18 October 1658 – 1686), nicknamed "Alexander the One-armed", was a Baltic German prince and the brother of Duke Frederick (II) Casimir of Courland.
He was the youngest son of Jakob Kettler (1610–1682), Duke of Courland and his wife Luise Charlotte von Brandenburg (1617–1676), eldest daughter of Prince elector Georg Wilhelm von Brandenburg.
He was a member of the Kettler dynasty.
Alexander served as an "Oberst" in a regiment of the Brandenburg-Prussian Army.
On 26 July 1686, he was mortally wounded in the second siege of Buda during the Ottoman wars and died shortly afterwards near Vienna.

Question: Who is the maternal grandmother of Alexander Of Courland?
Answer: Elizabeth Charlotte of the Palatinate