Archduke Franz Ferdinand of Austria
Archduke Franz Ferdinand Carl Ludwig Joseph Maria of Austria (18 December 1863 – 28 June 1914) was the heir presumptive to the throne of Austria-Hungary.
His assassination in Sarajevo precipitated Austria-Hungary's declaration of war against Serbia, which in turn triggered a series of events that eventually led to Austria-Hungary's allies and Serbia's declaring war on each other, starting World War I.
Princess Elisabeth, Duchess of Hohenberg
Princess Elisabeth, Duchess of Hohenberg (Elisabeth Hilda Zita Marie Anna Antonia Friederike Wilhelmine Luise; 22 December 1922 – 22 November 2011) was a Luxembourgian princess.
She was a daughter of Grand Duchess Charlotte and her husband, Prince Felix of Bourbon-Parma, the sister of Grand Duke Jean and the aunt of Grand Duke Henri.
In 1956 she married Franz, Duke of Hohenberg.
Stanisław Albrecht Radziwiłł
Prince Stanisław Albrecht" Stash" Radziwiłł( 21 July 1914 – 27 July 1976) was a Polish nobleman and a scion of the Polish- Lithuanian princely House of Radziwiłł.
His parents were Janusz Franciszek, Prince Radziwiłł( 1880 – 1967) and Princess Anna Lubomirska( 1882–1947).
Stanisław had two elder brothers, Edmund Radziwiłł( 1906 – 1971) and Ludwik Radziwiłł( 1911–1928).
Through his father, Stanislaw Albrecht was second cousin twice removed of Sophie, Duchess of Hohenberg, wife of the heir to the Austro- Hungarian throne Archduke Franz Ferdinand of Austria.
Princess Sophie of Hohenberg
Princess Sophie of Hohenberg(" Sophie Marie Franziska Antonia Ignatia Alberta von Hohenberg"; –) was the only daughter of Archduke Franz Ferdinand of Austria and his morganatic wife Sophie, Duchess of Hohenberg, both of whom were assassinated at Sarajevo on 28 June 1914.
Their assassination triggered the First World War, thus Sophie and her two brothers are sometimes described as the first orphans of the First World War.
Prince Ernst of Hohenberg
Prince Ernst of Hohenberg(" Ernst Alfons Franz Ignaz Joseph Maria Anton von Hohenberg"; 27 May 1904 – 5 March 1954) was the second son of Archduke Franz Ferdinand of Austria and his morganatic wife Sophie, Duchess of Hohenberg, who were assassinated at Sarajevo in 1914.
Sophie, Duchess of Hohenberg
Sophie, Duchess of Hohenberg (1 March 1868 – 28 June 1914), was the wife of Archduke Franz Ferdinand of Austria, the heir to the Austro-Hungarian throne.
Their assassination in Sarajevo sparked a series of events that eventually led to World War I.
Fehim Čurčić
Fehim Effendi Čurčić( 1866 – 12 February 1916) was a Bosnian politician who served as the 5th Mayor of Sarajevo from 1910 to 1915.
On 28 June 1914, Mayor Čurčić welcomed Archduke Franz Ferdinand of Austria and his wife Sophie, Duchess of Hohenberg to Sarajevo and was present later the same day at their assassination, the event that sparked World War I.
He died aged 50 in an Austrian sanatorium.
Franz, Duke of Hohenberg
Franz Ferdinand, Duke of Hohenberg( 13 September 1927 – 16 August 1977), was the eldest son of Maximilian, Duke of Hohenberg and Countess Maria of Waldburg zu Wolfegg und Waldsee.
He was also a grandson of Archduke Franz Ferdinand of Austria and his morganatic wife Sophie, Duchess of Hohenberg.
As a result of that morganatic marriage, the Hohenbergs were excluded from the line of succession to the Austro- Hungarian throne.
Following the socialist take- over in Vienna during the chaos at the close of The Great War and their exiling of the monarchy, all Austrian titles were subsequently abolished by law in 1919.
From then on, names officially consisted only of forename and surname, without von or titles, scilicet" Franz Ferdinand Hohenberg".
Most simply ignored this Decree.
Bohuslav, Count Chotek of Chotkow and Wognin
Bohuslav, Count Chotek von Chotkow und Wognin.
( 4 July 182911 October 1896) was a Bohemian nobleman and a diplomat in the service of Austria- Hungary.
He was the father of Sophie, Duchess of Hohenberg, the morganatic wife of Archduke Franz Ferdinand of Austria.
Georg, Duke of Hohenberg
Georg, Duke of Hohenberg( 25 April 1929 – 25 July 2019), was a grandson of Archduke Franz Ferdinand of Austria and his morganatic wife Sophie, Duchess of Hohenberg.
At the time of his death he was the senior agnate of the House of Habsburg- Lorraine.

Question: What is the date of birth of Sophie, Duchess Of Hohenberg's husband?
Answer: 18 December 1863