Princess Wilhelmina Caroline of Denmark
Princess Wilhelmina" Caroline" of Denmark and Norway( 10 July 1747 in Christiansborg Palace, Copenhagen – 14 January 1820 in Kassel), was the Landgravine consort of Hesse- Kassel and later the Electress of Hesse- Kassel by marriage to William I, Elector of Hesse.
Karoline von Schlotheim
Karoline von Schlotheim( 1766- 1847), was a German woman who was the royal mistress of William I, Elector of Hesse from 1788 until 1811.
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.
Charlotte Christine Buissine
Charlotte Christine Buissine( 1749 -?), was the royal mistress of William I, Elector of Hesse from 1775 until 1778.
She was the daughter of Henri Buissine and Charlotte Varlut.
She was replaced by Rosa Dorothea Ritter.
Issue: With William
I, Elector of Hesse, she had the children:
Princess Mary of Great Britain
Princess Mary of Great Britain (5 March 1723 – 14 January 1772) was the second-youngest daughter of King George II of Great Britain and his wife, Caroline of Ansbach, and Landgravine of Hesse-Kassel as the wife of Frederick II, Landgrave of Hesse-Kassel.
William I, Elector of Hesse
William I, Elector of Hesse (3 June 1743 – 27 February 1821) was the eldest surviving son of Frederick II, Landgrave of Hesse-Kassel (or Hesse-Cassel) and Princess Mary of Great Britain, the daughter of George II.
Marie Friederike of Hesse-Kassel
Marie Frederike of Hesse- Kassel( 14 September 1768, Hanau – 17 April 1839, Hanau) was a German noblewoman and by marriage Princess and later Duchess of Anhalt- Bernburg.
She was a daughter of William I, Elector of Hesse, and his wife, Princess Wilhelmina Caroline of Denmark.
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.
Maria Amalia of Courland
Maria Anna Amalia of Courland( 12 June 1653 – 16 June 1711) was a Landgravine of Hesse- Kassel through her marriage on 21 May 1673 to her first cousin Charles I, Landgrave of Hesse- Kassel.
She was the child of Jacob Kettler and Margravine Louise Charlotte of Brandenburg, eldest daughter of George William, Elector of Brandenburg.
Rosa Dorothea Ritter
Rosa Dorothea Ritter( 1759 – 1833), was the royal mistress of William I, Elector of Hesse from 1779 until 1788.
She was the daughter of Johann Georg Ritter and Maria Magdalena Witz.
She replaced Charlotte Christine Buissine.
In 1788, she was accused by William of having another sexual partner and replaced by Karoline von Schlotheim.
Issue: With William
I, Elector of Hesse, she had the children:

Question: Who is the maternal grandmother of William I, Elector Of Hesse?