Young Bosnia in the context of "Assassination of Archduke Franz Ferdinand"

Gavrilo Princip (Serbian Cyrillic: Гаврило Принцип, pronounced [ɡǎʋrilo prǐnt͡sip]; 25 July 1894 – 28 April 1918) was a Bosnian Serb student who assassinated Archduke Franz Ferdinand, heir presumptive to the throne of Austria-Hungary, and his wife Sophie, Duchess von Hohenberg, in Sarajevo on 28 June 1914. The assassination set off the July Crisis, a series of events that within one month led to the outbreak of World War I.

Princip was born in western Bosnia to a poor Serb family. Aged 13, he was sent to Sarajevo, the capital of Austrian-occupied Bosnia, to study at the Merchants' School. He later transferred to the gymnasium, where he became politically aware. In 1911, he joined Young Bosnia, a secret local society aiming to free Bosnia from Austrian rule and achieve the unification of the South Slavs. After attending anti-Austrian demonstrations in Sarajevo, he was expelled from school and walked to Belgrade, Serbia, to continue his education. During the First Balkan War, Princip traveled to Southern Serbia to volunteer with the Serbian army's irregular forces fighting against the Ottoman Empire but was rejected for being too small and weak. He also suffered from tuberculosis which was untreatable at the time and might have played a role in his motivation for the assassination.

Vaso Čubrilović (Serbian Cyrillic: Васо Чубриловић; 14 January 1897 – 11 June 1990) was a Yugoslav and Bosnian Serb scholar and politician.

As a teenager, he joined the South Slav student movement known as Young Bosnia and was involved in the conspiracy to assassinate Archduke Franz Ferdinand of Austria on 28 June 1914. His brother Veljko was also involved in the plot. Čubrilović was convicted of treason by the Austro-Hungarian authorities and given a sixteen-year sentence; his brother was sentenced to death and executed. Čubrilović was released from prison at war's end and studied history at the universities of Zagreb and Belgrade. In 1937, he delivered a lecture to the Serbian Cultural Club in which he advocated for the expulsion of the Albanians from Yugoslavia. Two years later, he became a history professor at the University of Belgrade. Following the Axis invasion of Yugoslavia in April 1941, Čubrilović was arrested by the Germans and sent to the Banjica concentration camp, where he remained imprisoned for much of the war.

Nedeljko Čabrinović (Serbian Cyrillic: Недељко Чабриновић; 1 February 1895 – 23 January 1916) was a Bosnian Serb typesetter and political activist, known for his role in the assassination of Archduke Franz Ferdinand in Sarajevo on 28 June 1914. A member of Young Bosnia, a nationalist revolutionary group advocating for the unification of South Slavs, he was one of six conspirators involved in the assassination attempt.

During the attack, Čabrinović threw a hand grenade at the Archduke's motorcade, but the explosive missed its target and detonated beneath the following vehicle. He was apprehended shortly after and later convicted of high treason. Since he was under 21, he was ineligible for the death penalty and received a twenty-year sentence of hard labour at the Theresienstadt fortress in Bohemia. While in prison, he endured harsh conditions and contracted tuberculosis, leading to his death on 23 January 1916. Following World War I, his remains were reinterred in Sarajevo alongside other conspirators in the Vidovdan Heroes Chapel.

Unification or Death (Serbian: Уједињење или смрт, romanized: Ujedinjenje ili smrt), popularly known as the Black Hand (Црна рука, Crna ruka), was a secret military society formed in May 1911 by officers in the Army of the Kingdom of Serbia. It gained a reputation for its alleged involvement in the assassination of Archduke Franz Ferdinand in Sarajevo in 1914 and for the earlier assassination of the Serbian royal couple in 1903, under the aegis of Captain Dragutin Dimitrijević (a.k.a. "Apis").

The society formed to unite all of the territories with a South Slavic majority that were not then ruled by either Serbia or Montenegro. It took inspiration primarily from the unification of Italy in 1859–1870, but also from the unification of Germany in 1871. Through its connections to the June 1914 assassination of Archduke Franz Ferdinand in Sarajevo, carried out by the members of the youth movement Young Bosnia, the Black Hand was instrumental in starting World War I (1914–1918) by precipitating the July Crisis of 1914, which eventually led to Austria-Hungary's invasion of the Kingdom of Serbia in August 1914.