Prince Louis of Liechtenstein
Prince Aloys Franz de Paula Maria( 18 November 1846 – 25 March 1920), known in English as Prince Louis, was the son of Prince Franz de Paula of Liechtenstein( 1802 – 1887) and younger brother of Prince Alfred of Liechtenstein.
He was the cousin of Johann II, Prince of Liechtenstein.
He was nicknamed" The Red Princeder rote Prinz").
Prince Franz Josef of Liechtenstein (1962–1991)
Prince Franz Josef Wenceslaus Georg Maria of Liechtenstein( German:" Prinz Franz Josef von und zu Liechtenstein"; 19 November 1962 – 28 February 1991) was a member of the princely family of Liechtenstein.
Prince Alfred of Liechtenstein
Prince Alfred Louis of Liechtenstein( Alfred Aloys Eduard; 11 June 1842 in Prague – 8 October 1907 in Frauenthal castle) was the son of Prince Franz de Paula of Liechtenstein( 1802 – 1887) and Countess Julia Eudoxia Potocka- Piława( 1818–1895), older brother of Prince Louis of Liechtenstein, and cousin and brother- in- law of Franz I of Liechtenstein.
He was the 1,143rd Knight of the Order of the Golden Fleece in Austria in 1903.
Johann Nepomuk Karl, Prince of Liechtenstein
Johann Nepomuk
Karl, Prince of Liechtenstein( Johann Nepomuk Karl Borromäus Josef Franz de Paula; 6 July 1724 – 22 December 1748) was the Prince of Liechtenstein between 1732 and 1748.
He was the son of Johann Josef Adam.
Franz de Paula Triesnecker
Franz de Paula Triesnecker (April 2, 1745 – January 29, 1817) was an Austrian Jesuit astronomer.
Franz Joseph I, Prince of Liechtenstein
Franz Joseph I, Prince of Liechtenstein, born" Franz de Paula Josef Johann Nepomuk Andreas"( 19 November 1726 – 18 August 1781), was the Prince of Liechtenstein from 1772 until his death.
Prince Franz de Paula of Liechtenstein
Prince Franz de Paula of Liechtenstein(" Franz de Paula Joachim Joseph")
( Vienna, 25 February
1802 – Vienna, 31 March 1887) was a son of Johann I Joseph, Prince of Liechtenstein( 1760- 1836) and wife Landgravine Josepha of Fürstenberg- Weitra, nephew of Aloys I, brother of Aloys II and uncle of Johann II and Franz I.
Elisabeth von Gutmann
Elisabeth von Gutmann( 6 January 187528 September 1947) was Princess of Liechtenstein as the wife of Prince Franz I.
Johann I Joseph, Prince of Liechtenstein
Johann I Joseph(" Johann Baptist Josef Adam Johann Nepomuk Aloys Franz de Paula"; 26 June 1760 – 20 April 1836) was Prince of Liechtenstein between 1805 and 1806 and again from 1814 until 1836.
He was the last Liechtenstein prince to rule under the Holy Roman Empire between 1805 and 1806 and as regent of Liechtenstein from 1806 until 1814.
He was the fourth son of Franz Joseph I, Prince of Liechtenstein.
Franz I, Prince of Liechtenstein
Franz I, Prince of Liechtenstein, born" Franz de Paula Maria Karl August"( 28 August 1853 – 25 July 1938), was the Prince of Liechtenstein between 1929 and 1938.

Question: Who is Prince Franz De Paula Of Liechtenstein's paternal grandfather?
Answer: Franz Joseph I