Francesco Maria Ruspoli, 6th Prince of Cerveteri
Francesco Maria, Principe Ruspoli (November 30, 1839 – January 23, 1907) was the 6th Principe di Cerveteri, 6th Marchese di Riano, 11th Conte di Vignanello and Prince of the Holy Roman Empire, son of Giovanni Nepomucene Ruspoli, 5th Prince of Cerveteri and wife
Barbara dei Principi Massimo.
Francesco Ruspoli, 3rd Prince of Cerveteri
Francesco, Prince Ruspoli, 3rd Prince of Cerveteri, 3rd Marquis of Riano, 8th Count of Vignanello( February 19, 1752 – March 8, 1829) was the 3rd Prince of Cerveteri, 3rd Marquis of Riano and 8th Count of Vignanello, son of Alessandro Ruspoli, 2nd Prince of Cerveteri and second wife and first cousin Prudenza dei Conti Marescotti- Capizucchi.
His uncle was Bartolomeo Ruspoli.
In 1792 he was created Prince of the Holy Roman Empire both he and his male descendants, by the Emperor Francis II.
Rudolf, 6th Prince Kinsky of Wchinitz and Tettau
Rudolf, 6th Prince Kinsky of Wchinitz and Tettau( 30 March 180227 January 1836) was the 6th Prince Kinsky of Wchinitz and Tettau.
Francesco Maria Bovio
Francesco Maria Bovio( ca. 1750- 1830) was an Italian lawyer, judge and professor.
He's best known for being the grandfather of Italian philosopher Giovanni Bovio( 1837- 1903).
He also fought for the Parthenopean Republic( 1799) during the so- called Altamuran Revolution( 1799).
Alessandro Ruspoli, 7th Prince of Cerveteri
Alessandro, Principe Ruspoli
( January 14, 1869 – September 28, 1952), Grand Master of the Sacred Apostolic Hospice, was the 7th Principe di Cerveteri, 7th Marchese di Riano, 12th Conte di Vignanello and Prince of the Holy Roman Empire, son of Francesco Maria Ruspoli, 6th Prince of Cerveteri and wife Egle dei Conti Franchesi.
Bartolomeo Ruspoli and Khevenhüller-Metsch
Bartolomeo Ruspoli and Khevenhüller- Metsch, dei principi Ruspoli( October 26, 1800 – 1872) was an Italian aristocrat, Prince of the Holy Roman Empire, son of Francesco Ruspoli, 3rd Prince of Cerveteri and second wife Leopoldina Countess von Khevenhüller- Metsch.
He had four brothers, among others, Alessandro Ruspoli, 4th Prince of Cerveteri, and Camillo Ruspoli, Duke of Sueca.
He was colonel of the Piedmontese army, in which he participates in the wars of the Italian resurgence.
Paralyzed from below waist by the blast of a grenade, he continued to participate in wheelchair battles pushed by his assistant.
Bartolomeo is the ancestor of the Line III of the Princes Ruspoli.
His son Emanuele Ruspoli was named first prince of Poggio- Suasa after participating in the Italian unification and being the first Mayor of the Italian Rome.
He was the grandfather of Donna Emanuella de Dampierre Ruspoli, Duchess of Segovia and Duchess of Anjou by her marriage to Infante Don Jaime, son of Alfonso XIII of Spain.
Emanuele is the founder of the third Ruspoli line: The Princes of Poggio- Suasa.
Giovanni Nepomucene Ruspoli, 5th Prince of Cerveteri
Giovanni Nepomucene, Principe Ruspoli (June 28, 1807 – November 6, 1876) was the 5th Principe di Cerveteri, 5th Marchese di Riano, 10th Conte di Vignanello, and Prince of the Holy Roman Empire son of Alessandro Ruspoli, 4th Prince of Cerveteri and wife Mariana Gräfin Esterházy de Galántha and ancestor of the Line
I of the Principi Ruspoli.
Alessandro Ruspoli, 4th Prince of Cerveteri
Alessandro, Principe Ruspoli( October 5, 1784 – October 31, 1842) was the 4th Prince of Cerveteri, 4th Marquis of Riano, 9th Count of Vignanello and Prince of the Holy Roman Empire, son of Francesco Ruspoli, 3rd Prince of Cerveteri and second wife HIH Leopoldina Gräfin von Khevenhüller- Metsch.
He had for brothers, among others, Camillo Ruspoli, Duke of Sueca, and Bartolomeo Ruspoli and Khevenhüller- Metsch.
His granduncle was Bartolomeo Ruspoli.
Alessandro is the ancestor of the Line I of the Princes Ruspoli.
Alessandro Ruspoli, 2nd Prince of Cerveteri
Alessandro, Principe Ruspoli
( December 3, 1708 – June 20, 1779) was the 2nd Principe di Cerveteri, 2nd Marchese di Riano and 7th Conte di Vignanello, son of Francesco Maria Marescotti Ruspoli, 1st Prince of Cerveteri and wife Isabella Cesi dei Duchi di Acquasparta, maternal niece of Pope Innocent XIII.
His brother was Bartolomeo Ruspoli.
Karl, Prince of Leiningen
Karl, Prince of Leiningen( 13 February 18982 August 1946) was the son of Emich, 5th Prince of Leiningen.
He was the 6th Prince of Leiningen from 1939 until his death.

Question: Who is Francesco Maria Ruspoli, 6Th Prince Of Cerveteri's paternal grandfather?
Answer: Alessandro Ruspoli, 4th Prince of Cerveteri