Prince Mirko of Montenegro

Prince Mirko Dimitri Petrović-Njegoš of Montenegro was born in Cetinje, the second son of King Nicholas I of Montenegro and Milena Vukotić. Prince Mirko predeceased his father and his elder brother Crown Prince Danilo.

Marriage

On 25 July 1902, in Cetinje, Prince Mirko married Natalija Konstantinović, daughter of Colonel Alexander Konstantinović and his wife, Milena Opuić from Trieste. She was paternal granddaughter of Aleksandar Konstantinović and his wife, Princess Anka Obrenović, daughter of Jevrem Obrenović, younger brother of Miloš Obrenović I, Prince of Serbia, and wife Tomanija Bogicević.
The couple had five sons before divorcing in October 1917:

Prince Šćepac
Prince Stanislaw
Prince Michael, he married in Paris on 27 January 1941 Geneviève Denise Charlotte Prigent, second daughter of Dr. François Marie Prigent. They had one son:
*Nicholas, Prince of Montenegro On 27 November 1976 in Trébeurden, Côtes-du-Nord, he married Francine Navarro. They two children:
**Princess Altinaï of Montenegro, born at Les Lilas, Seine-Saint-Denis on 27 October 1977. She is a filmmaker and married Russian violinist Anton Martynov on 12 May 2009. The couple has one son:
*** Nikolai Martynov
** Boris, Hereditary Prince of Montenegro, Grand-Duke of Grahovo and Zeta, born at Les Lilas on 21 January 1980. He is a creative director at Renault France and married architect Véronique Haillot Canas da Silva on 12 May 2007. They have two daughters:
***Miléna
***Antonia
Prince Pavle
Prince Emmanuel.

Their eldest surviving son Prince Michael of Montenegro, succeeded Mirko in the Montenegrin royal succession and would become head of the House of Petrović-Njegoš and pretender to the Montenegrin throne.

Serbian throne

As Prince Mirko's wife was the granddaughter of Anka Obrenović, a member of the Serbian House of Obrenović, it was agreed with the Serbian Government that Prince Mirko would be proclaimed Crown Prince of Serbia in the event that the marriage of King Alexander and Draga Mašin was childless.
Following the assassination of Alexander and Draga in 1903, the resulting conferral of the crown was given to Peter Karađorđević, his brother-in-law. In 1911 he joined the Black Hand "Unity or Death" secret society which sought the unification of all Serbs in the Balkans, especially those under Austria-Hungary.

Death

Mirko divorced his wife in 1917. He moved from Paris to Vienna, where he died in 1918. Following his death, his ten-year-old son Prince Michael of Montenegro was raised in Paris by his mother and the residual members of the exiled Montenegrin Royal Family. In 1921 following the death of Mirko's father and shortly afterwards by the renouncement of the defunct throne by former Crown Prince Danilo, the thirteen-year-old Prince Michael of Montenegro became the head of the Petrović-Njegoš house, albeit initially under a pretense regency.