Veljko Čubrilović Veljko Čubrilović Veljko Čubrilović (Serbian Cyrillic: Вељко Чубриловић; 6 June 1886 – 3 February 1915) was a Bosnian Serb who was involved in the assassination of Archduke Franz Ferdinand of Austria. He was born in Gradiška, Bosnia and Herzegovina and became a schoolteacher in Priboj Majevički. In 1914, as a member of the Black Hand secret society, he agreed to help Gavrilo Princip, Nedeljko Čabrinović, and Trifko Grabež assassinate Archduke Franz Ferdinand. His brother, Vaso Čubrilović, was also involved in the plot. On Sunday, 28 June 1914, Franz Ferdinand and Sophie von Chotkova were assassinated by Gavrilo Princip. Princip and
Yugoslavism this we all become members of one united Jugo-slav nation. The assassination of Archduke Franz Ferdinand of Austria by Yugoslavist revolutionary Gavrilo Princip, a Serb associated with Young Bosnia, a group composed of mainly Serbs, but also Bosnian Muslims and Croats, marked the beginning of a militant nationalist activity by South Slavs against Austro-Hungarian rule. At his trial in 1914, Princip stated: "I am a Yugoslav nationalist, aiming for the unification of all Yugoslavs, and I do not care what form of state, but it must be free from Austria." The assassination of Franz Ferdinand however triggered resentment amongst those