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
Assassination of Archduke Franz Ferdinand of killing Franz Ferdinand came from a newspaper clipping he received in the mail at the end of March announcing Franz Ferdinand's planned visit to Sarajevo. He then showed the newspaper clipping to Princip and the next day they agreed they would kill Franz Ferdinand. Princip explained to the court he had already read about Franz Ferdinand's upcoming visit in German papers. Princip went on to testify that, at about the time of Easter (19 April), he wrote an allegorical letter to Ilić informing him of the plan to kill Franz Ferdinand. Grabež testified that he and Princip, also at