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
Slobodan Princip number of schools in Bosnia and Belgrade have been named after him as well. Slobodan Princip Slobodan Princip (; 25 May 1914–May 1942), nicknamed Seljo (Сељо), was a Yugoslav Partisan fighter and the district staff chief of Partisan Sarajevo Oblast during World War II. He was posthumously awarded the Hero of Yugoslavia. He was the nephew of Gavrilo Princip. Princip was born in Hadžići, near Sarajevo, Austria-Hungary (now Bosnia and Herzegovina), into an ethnic Serb family. His father Jovan ("Jovo") was the brother of Gavrilo Princip, the assassin of Archduke Franz Ferdinand of Austria. He joined the Communist Youth (SKOJ)