Causes of World War I corrective." British Diplomat Arthur Nicolson wrote in May 1914, “Since I have been at the Foreign Office I have not seen such calm waters.” On 28 June 1914, Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, were shot dead, by two gun shots in Sarajevo by Gavrilo Princip, one of a group of six assassins (five Serbs and one Bosniak) coordinated by Danilo Ilić, a Bosnian Serb and a member of the Black Hand secret society. The assassination is significant because it was perceived by Austria-Hungary as an existential challenge
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)