Constantine, Prince of Hohenzollern-Hechingen
Constantin, Prince of Hohenzollern- Hechingen( Friedrich Wilhelm Konstantin Hermann Thassilo; 16 February 1801 – 3 September 1869), was the last Prince of Hohenzollern- Hechingen.
Constantine was the only child of Frederick, Prince of Hohenzollern- Hechingen and his wife, Princess Pauline of Courland, the daughter of the last Duke of Courland, Peter von Biron.
Frederick, Prince of Hohenzollern
Frederick, Prince of Hohenzollern( 30 August 1891 in Heiligendamm, Mecklenburg- Schwerin – 6 February 1965 in Krauchenwies, Baden- Württemberg, Germany) was the eldest son of William, Prince of Hohenzollern and Princess Maria Teresa of Bourbon- Two Sicilies.
He had a twin brother, Franz Joseph, Prince of Hohenzollern- Emden, who was born a few minutes after he was.
Friedrich Wilhelm, Prince of Hohenzollern
Friedrich Wilhelm, Prince of Hohenzollern( 3 February 1924 – 16 September 2010) was the head of the Princely House of Hohenzollern for over 45 years.
Prince Karl Anton of Hohenzollern
Prince Karl Anton of Hohenzollern- Sigmaringen( 1 September 1868 – 21 February 1919) was a member of the Princely House of Hohenzollern- Sigmaringen.
Karl Anton was the third and youngest son of Leopold, Prince of Hohenzollern and his wife Infanta Antónia of Portugal.
Karl Anton's elder brothers were William, Prince of Hohenzollern and Ferdinand I of Romania.
Leopold, Prince of Hohenzollern
Leopold,
Prince of Hohenzollern  (22 September 1835 – 8 June 1905) was the head of the Swabian branch of the House of Hohenzollern, and played a fleeting role in European power politics, in connection with the Franco-Prussian War.
He was born into the dynasty's surviving Sigmaringen branch, which inherited all the dynasty's Swabian lands when the Hohenzollern-Hechingen branch became extinct.
Leopold's parents were Josephine of Baden and Karl Anton, Prince of Hohenzollern.
Leopold was the older brother of King Carol I of Romania and father of the future King Ferdinand of Romania.
Carol ascended the Romanian throne in 1866, and Leopold renounced his rights to the Romanian succession in favor of his sons in 1880.
Frederick XI, Count of Hohenzollern
Friedrich XI, Count of Hohenzollern( died 26 November 1401), nicknamed" Friedrich the Elder" was a German nobleman.
He was a member of the House of Hohenzollern and a ruling Count of Hohenzollern- Hechingen.
Alexander, Hereditary Prince of Hohenzollern
Alexander, Hereditary Prince of Hohenzollern( born 16 March 1987 in New York City) is a member of the Princely House of Hohenzollern.
Alexander is the eldest son of Karl Friedrich, Prince of Hohenzollern and Countess Alexandra Schenck von Stauffenberg, who divorced in 2010.
He is the heir apparent to the headship of the princely house.
Karl Anton, Prince of Hohenzollern
Prince Karl Anton of Hohenzollern-Sigmaringen  (7 September 1811 – 2 June 1885) was head of the Princely House of Hohenzollern-Sigmaringen, Hohenzollern from 1869 and Prime Minister of Prussia.
He was the son of Karl, Prince of Hohenzollern-Sigmaringen, who abdicated in favour of his son on 27 August 1848, and his first wife Marie Antoinette Murat, niece of Joachim Murat.
Karl Friedrich, Prince of Hohenzollern
Karl Friedrich, Prince of Hohenzollern( born 20 April 1952) is the eldest son of the late Friedrich Wilhelm, Prince of Hohenzollern and Princess Margarita of Leiningen.
He became head of the Princely House of Hohenzollern, the Roman Catholic Swabian branch of the dynasty, upon his father's death on 16 September 2010.
William, Prince of Hohenzollern
William, Prince of Hohenzollern( 7 March 1864 in Schloss Benrath, near Düsseldorf – 22 October 1927 in Sigmaringen) was the eldest son of Leopold, Prince of Hohenzollern and Infanta Antónia of Portugal.
William was an older brother of Ferdinand of Romania.
His maternal first cousins included( among others)
Carlos I of Portugal, Infante Afonso, Duke of Porto, Frederick Augustus III of Saxony, and Princess Maria Josepha of Saxony.
Between 1880 and 1886, William was heir presumptive to the Romanian throne.
On 20 December 1886, he renounced his rights to the throne in favor of his brother Ferdinand.

Question: What is the date of death of Leopold, Prince Of Hohenzollern's father?
Answer: 2 June 1885