Princess Friederike of Hanover
Princess Friederike of Hanover( born 15 October 1954 at Salem, Baden- Württemberg, Germany) is a member of the Royal House of Hanover.
She is a niece of Prince Philip, Duke of Edinburgh.
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.
Christian Bernardi (footballer)
Christian Oscar Bernardi( born 10 March 1990) is an Argentine professional footballer who plays as a midfielder for Argentine Primera División side Colón.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Prince Christian Oscar of Hanover
Prince Christian Oscar of Hanover (1 September 1919 – 10 December 1981) was the fourth child of Ernest Augustus, Duke of Brunswick and his wife Princess Victoria Louise of Prussia, the only daughter of Wilhelm II, German Emperor and Augusta Viktoria of Schleswig-Holstein.
Alessandra de Osma
Alessandra, Princess Christian of Hanover( née Alessandra de Osma) is a Peruvian attorney, handbag designer, and former model.
She is a member of the Hanoverian royal family through her marriage to Prince Christian of Hanover.
Thyra von Westernhagen
Thyra, Princess Heinrich of Hanover( née Thyra von Westernhagen; born 14 August 1973) is a German forester and landowner.
As the wife of Prince Heinrich of Hanover, she is a princess of the House of Hanover.
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.
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.
Princess Victoria Louise of Prussia
Princess Victoria Louise of Prussia (Viktoria Luise Adelheid Mathilde Charlotte; 13 September 1892 – 11 December 1980) was the only daughter and the last child of German Emperor Wilhelm II and Augusta Victoria of Schleswig-Holstein.
She was a great-granddaughter of Queen Victoria through her father.
Her 1913 wedding to Prince Ernest Augustus of Hanover was the largest gathering of reigning monarchs in Germany since German unification in 1871, and one of the last great social events of European royalty before the First World War began fourteen months later.
Shortly after the wedding, she became the Duchess of Brunswick by marriage.
Through her daughter Frederica, Princess Victoria Louise was the maternal grandmother of Queen Sophia of Spain (mother of Felipe VI of Spain) and the former King Constantine II of Greece.

Question: Who is Prince Christian Oscar Of Hanover's maternal grandmother?
Answer: Augusta Victoria