On June 28th, 1914, the assassination of Archduke Franz Ferdinand and his wife, Duchess Sophie, took place in Sarajevo, Bosnia. This event started World War I, also called "The Great War." The Young Bosnians, a group of young people who wanted independence for Bosnia, planned the attack. Gavrilo Princip, a member of the group, shot the Archduke and Duchess, which led to a period of tension known as the July Crisis. Historians still see this event as a major cause of the war.