Duchess Sophia Charlotte of Oldenburg
Duchess Sophia Charlotte of Oldenburg (2 February 1879 – 29 March 1964) was a member of the House of Holstein-Gottorp.
She was the only surviving child of Frederick Augustus II, Grand Duke of Oldenburg by his first wife Princess Elisabeth Anna of Prussia.
Sophia Charlotte ("Lotte") is best known for her unhappy and well-publicized marriage to Prince Eitel Friedrich, second son of Wilhelm II, German Emperor.
The marriage later led to divorce; Sophia Charlotte would remarry a few years later to Harald van Hedemann, a former police officer.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Princess Charlotte of Prussia (1831–1855)
Princess Charlotte of Prussia( 21 June 1831 – 30 March 1855), was by birth a Princess of Prussia and member of the House of Hohenzollern and by marriage Hereditary Princess of Saxe- Meiningen.
She was the eldest child and daughter of Prince Albert of Prussia( younger son of Frederick William III of Prussia and Louise of Mecklenburg- Strelitz) and his first wife Princess Marianne of the Netherlands( daughter of William I of the Netherlands and Wilhelmine of Prussia).
Frederick Augustus II, Grand Duke of Oldenburg
Frederick Augustus II( 16 November 1852 in Oldenburg – 24 February 1931 in Rastede) was the last ruling Grand Duke of Oldenburg.
He married Princess Elisabeth Anna of Prussia, daughter of Princess Maria Anna of Anhalt- Dessau and Prince Frederick Charles of Prussia.
After her death, he married Elisabeth Alexandrine of Mecklenburg- Schwerin.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Duchess Anna of Prussia
Duchess Anna of Prussia and Jülich-Cleves-Berg (3 July 1576 – 30 August 1625) was Electress consort of Brandenburg and Duchess consort of Prussia by marriage to John Sigismund, Elector of Brandenburg.
She was the daughter of Albert Frederick, Duke of Prussia, and Marie Eleonore of Cleves.
Dorothea of Denmark, Duchess of Prussia
Dorothea of Denmark (1 August 1504 – 11 April 1547), was a Duchess of Prussia by marriage to Duke Albert, Duke of Prussia.
She was the daughter of King Frederick I of Denmark and Anna of Brandenburg.
Princess Elisabeth of Prussia
Princess Elisabeth of Prussia( 18 June 1815 – 21 March 1885) was the second daughter of Prince Wilhelm of Prussia and Landgravine Marie Anna of Hesse- Homburg and a granddaughter of Frederick William II of Prussia.
Prince Philip, Duke of Edinburgh is her great- great- grandson.
Princess Maria Anna of Anhalt-Dessau
Princess Maria Anna of Anhalt-Dessau (14 September 1837, Dessau – 12 May 1906, Friedrichroda) was a princess from the House of Ascania.
She was the third child of Leopold IV, Duke of Anhalt and Princess Frederica of Prussia.
Princess Elisabeth Anna of Prussia
Princess Elisabeth Anna of Prussia (8 February 1857 – 28 August 1895) was a German princess.
She was the second child of Prince Frederick Charles of Prussia and Princess Maria Anna of Anhalt-Dessau.
The Elisabeth-Anna-Palais was named in her honor after her early death in 1895.

Question: Who is Princess Elisabeth Anna Of Prussia's maternal grandfather?
Answer: Leopold IV