Marco Torlonia, 6th Prince of Civitella-Cesi
"Don" Marco Alfonso Torlonia, 6th Prince of Civitella-Cesi (2 July 1937 – 5 December 2014) was the son of Alessandro Torlonia, 5th Prince of Civitella-Cesi and his wife, Infanta Beatriz of Spain, daughter of King Alfonso XIII of Spain.
He was, therefore, first cousin to King Juan Carlos I of Spain.
He was also an uncle to Princess Sibilla of Luxembourg, daughter of his younger sister, Olimpia.
Alessandro Torlonia, 2nd Prince of Civitella-Cesi
Prince" Don" Alessandro Raffaele Torlonia, Prince of Fucino, Prince of Civitella- Cesi, Duke of Ceri( January 1, 1800 – February 7, 1886) was an Italian nobleman of the House of Torlonia.
titled Duca di Ceri, Prince di Fucino.
He was the son of Giovanni Torlonia, 1st Prince di Civitella- Cesi( 1754- 1829).
Marino Torlonia, 4th Prince of Civitella-Cesi
Marino Torlonia( 29 July 1861 – 5 March 1933), 4th Prince of Civitella- Cesi, duke of Poli and Guadagnolo, was an Italian nobleman.
Alessandro Torlonia, 5th Prince of Civitella-Cesi
Don Alessandro Torlonia (7 December 1911 – 1 May/12
May 1986)
was the 5th Prince di Civitella-Cesi.
Born in Rome, Torlonia was the son of Marino Torlonia, 4th Prince di Civitella-Cesi and his American wife, Mary Elsie Moore.
On the death of his father in 1933, he inherited large estates as well as his father's princely and other titles.
He died in the Palazzo Torlonia, Rome, in 1986.
Augusto Torlonia, 3rd Prince of Civitella Cesi
Don Augusto Torlonia, of the House of Torlonia, was an Italian nobleman and third Prince of Civitella- Cesi.
Augusto inherited the title from his grandfather's younger brother, Alessandro Torlonia, 2nd Prince of Civitella- Cesi.
Augusto was born in Rome on 20 January 1855 and died in Borgo San Donnino on 17 April 1926.
His father was Giulio, 2nd Duke of Poli and Guadagolo, and his mother was Donna Teresa dei Principi Chigi- Albani.
Upon Augusto's death, the title passed to his brother, Marino Torlonia, 4th Prince of Civitella- Cesi.
Infanta Beatriz of Spain
Infanta Beatriz of Spain, Princess of Civitella-Cesi ("Doña Beatriz Isabel Federica Alfonsa Eugénie Cristina Maria Teresia Bienvenida Ladislàa de Borbón y Battenberg"; 22 June 1909 – 22 November 2002) was a daughter of King Alfonso XIII of Spain and Victoria Eugenie of Battenberg, wife of Alessandro Torlonia, 5th Prince di Civitella-Cesi.
She was a paternal aunt of King Juan Carlos I.
Mary Elsie Moore
Mary Elsie Moore, Princess Civitella- Cesi( October 22, 1889 – December 21, 1941), was an American heiress who married and divorced Italian Prince Don Marino Torlonia, 4th Prince of Civitella- Cesi.
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.
Friedrich Wilhelm, Prince of Wied
Friedrich Wilhelm, Prince of Wied( 2 June 193128 August 2000) was the son of Hereditary Prince Hermann of Wied and Countess Marie Antonia of Stolberg- Wernigerode; and grandson of William Frederick, 6th Prince of Wied.
He was the titular Prince of Wied from 1945 until his death.
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: Where did Marco Torlonia, 6Th Prince Of Civitella-Cesi's father die?
Answer: Rome