Prince Valdemar of Denmark
Prince Valdemar of Denmark, (27 October 1858 – 14 January 1939) was the third son and youngest child of Christian IX and Louise of Hesse-Kassel.
He had a lifelong naval career.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Countess Anne Dorte of Rosenborg
Countess Anne Dorte of Rosenborg( née Anne Dorte Maltoft- Nielsen; 3 October 1947 – 2 January 2014) was a Danish countess.
She was the wife of Count Christian of Rosenborg, the grandson of King Christian X of Denmark.
Prince Christian had to give up his princely rank in order to marry her because she was a commoner.
The couple married on 7 February 1971, earning her the title" Her Excellency Countess Anne Dorte of Rosenborg".
Since 1991, Anne Dorte and Christian of Rosenborg resided in a detached classical wing of the royal palace Sorgenfri in Lyngby near Copenhagen.
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.
Prince Viggo, Count of Rosenborg
Prince Viggo, Count of Rosenborg ("Viggo Christian Adolf Georg"; 25 December 1893 – 4 January 1970) was a Danish prince.
He was born in Copenhagen the youngest son of Prince Valdemar of Denmark and Princess Marie of Orléans.
He was also the youngest grandson of Christian IX of Denmark.
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.
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.
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.

Question: Who is Prince Viggo, Count Of Rosenborg's paternal grandmother?
Answer: Louise of Hesse-Kassel