Prince Louis Ferdinand of Prussia (1772–1806)
Prince Louis Ferdinand of Prussia (Friedrich Ludwig Christian; 18 November 1772 – 10 October 1806), was a Prussian prince and a soldier in the Napoleonic Wars.
Louis Ferdinand was born in Friedrichsfelde Palace near Berlin.
He was a son of Prince August Ferdinand of Prussia and Elisabeth Louise of Brandenburg-Schwedt, and was a nephew of King Frederick the Great.
Ludwig von Wildenbruch was the elder of two illegitimate children of Louis Ferdinand by Henriette Fromme.
The 1927 German film "Prinz Louis Ferdinand" was a biopic of his life.
Princess Marianne of Prussia
Princess Marianne of Prussia( 23 August 19131 March 1983) was a member of the House of Hohenzollern, daughter of Prince Friedrich Wilhelm of Prussia.
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).
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 Frederica of Prussia (1796–1850)
Princess Frederica of Prussia( 30 September 1796 – 1 January 1850) was a daughter of Prince Louis Charles of Prussia and Frederica of Mecklenburg- Strelitz.
She was a member of the House of Hohenzollern.
By her marriage to Leopold IV, Duke of Anhalt- Dessau, she would become Duchess consort of Anhalt- Dessau.
Louis Ferdinand Elle the Younger
Louis Ferdinand Elle the Younger (1648 in Paris – 1717 in Paris), was a French portrait painter and the son of Louis Ferdinand Elle the Elder.
Grand Duchess Kira Kirillovna of Russia
Grand Duchess Kira Kirillovna of Russia (9 May 1909 – 8 September 1967) was the second daughter of Grand Duke Kirill Vladimirovich of Russia and Princess Victoria Melita of Saxe-Coburg and Gotha.
She married the head of the German Imperial House, Prince Louis Ferdinand of Prussia.
Prince Augustus Ferdinand of Prussia
Prince Augustus Ferdinand of Prussia (23 May 1730, Berlin – 2 May 1813, Berlin) was a Prussian prince and general, as well as "HerrenmeisterMaster of the Knights") of the Bailiwick of Brandenburg of the Order of Saint John.
He belonged to the House of Hohenzollern, and was the youngest son of Frederick William I of Prussia by his wife, Queen Sophia Dorothea.
Ludwig von Wildenbruch
Anton Albert Heinrich" Ludwig"( or Louis) von Wildenbruch( 1803 – 1874) was Prussian general and diplomat.
He served as consul general in Beirut in the mid-19th century.
He was also the Prussian ambassador to Constantinople from 1852 to 1859.
An amateur scientist, his reports were published in various learned journals of the time.
Wildenbruch was an illegitimate son of Prince Louis Ferdinand of Prussia by Henriette Fromme.
In 1837 he married Ernestine von Langen( 1805 – 1858), by whom he had four children who lived to adulthood.
Two years after his first wife's death he wed Flora Nicolovius( 1811–1879).
A son of Wildenbruch's first marriage was the poet and dramatist Ernst von Wildenbruch.
Prince Louis Ferdinand of Prussia (1944–1977)
Prince Louis Ferdinand Oskar Christian of Prussia( German:" Louis Ferdinand Oskar Christian Prinz von Preußen"; 25 August 1944 – 11 July 1977), also called Louis Ferdinand II or Louis Ferdinand Jr., nicknamed" Lulu", was a member of the House of Hohenzollern and the fifth of seven children of Prince Louis Ferdinand of Prussia and his wife, Grand Duchess Kira of Russia.

Question: Who is Prince Louis Ferdinand Of Prussia (1772–1806)'s paternal grandfather?
Answer: Frederick William I of Prussia