Moritz, Landgrave of Hesse
Moritz, Prince and Landgrave of Hesse(" Moritz Friedrich Karl Emanuel Humbert" 6 August 1926 – 23 May 2013) was the son of Prince Philip, Landgrave of Hesse, and the head of the House of Brabant and the German House of Hesse.
Prince Christian of Hesse-Philippsthal-Barchfeld
Prince Christian of Hesse ("Christian Ludwig Friedrich Adolf Alexis Wilhelm Ferdinand"; 16 June 1889 – 19 October 1971) was a member of the House of Hesse-Philippsthal-Barchfeld and a German naval officer until he resigned his commission during World War I in protest at Germany's policy of unrestricted submarine warfare.
As a member of the House of Hesse, he was styled "His Highness Prince Christian of Hesse".
In order to distinguish between the various branches of the house, the designation "-Philippsthal-Barchfeld" was sometimes added to the end of the princely title.
Prince Christian of Denmark (1675–1695)
Prince Christian of Denmark and Norway( 25 March 1675 – 27 June 1695) was the third son of Christian V of Denmark and his consort, Charlotte Amalie of Hesse- Kassel, and thus a younger brother of King Frederick IV.
He died aged 20, and never married.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
Christian of Oliva
Christian of Oliva, also Christian of Prussia( died 4 December 1245) was the first missionary bishop of Prussia.
Princess Louise of Denmark (1750–1831)
Princess Louise of Denmark and Norway  (20 January 1750 – 12 January 1831) was born to Frederick V of Denmark and Louise of Great Britain.
Her eldest daughter, Marie of Hesse-Kassel, was the wife of Frederick VI of Denmark.
Prince Christian of Hesse
Prince Christian of Hesse  (14 August 1776 – 14 November 1814) was a German prince and member of the House of Hesse-Kassel.
As a son of the Danish Field Marshal Prince Charles of Hesse-Kassel and Princess Louise of Denmark, he was a member of the extended Danish Royal Family and spent his entire life in Denmark.

Question: Who is Prince Christian Of Hesse's maternal grandmother?
Answer: Louise of Great Britain