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.
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.
Elizabeth Stuart, Queen of Bohemia
Elizabeth Stuart (19 August 159613 February 1662) was Electress of the Palatinate and briefly Queen of Bohemia as the wife of Frederick V of the Palatinate.
Because her husband's reign in Bohemia lasted for just one winter, Elizabeth is often referred to as the "Winter Queen".
Elizabeth was the second child and eldest daughter of James VI and I, King of Scotland, England, and Ireland, and his wife, Anne of Denmark.
With the demise of the last Stuart monarch in 1714, Elizabeth's grandson succeeded to the British throne as George I, initiating the Hanoverian dynasty.
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.
Philip Frederick of the Palatinate
Philip Frederick of the Palatinate ("Prince Palatine John Philip Frederick", 16 September 1627 – 16 December 1650), was the seventh son of Frederick V, Elector Palatine (of the House of Wittelsbach), the "Winter King" of Bohemia, by his consort, the English princess Elizabeth Stuart.
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.
Louise Hollandine of the Palatinate
Louise Hollandine of the Palatinate( 18 April 1622 – 11 February 1709) was a painter and abbess.
She was a daughter of Frederick V of the Palatinate and King of Bohemia, and Elizabeth Stuart.
Philip James
Philip Frederick Wright James( May 17, 1890 – November 1, 1975) was an American composer, conductor and music educator.

Question: Who is Philip Frederick Of The Palatinate's maternal grandmother?
Answer: Anne of Denmark