This Day in History: 0000-06-28

28 Jun – Archduke Franz Ferdinand, heir to the throne of Austria, and his wife Sophie were assassinated in Belgrade by Serbian nationalist Gavrilo Princip, resulting in an Austrian declaration of war on Serbia on 28 July, a Russian declaration of war on Austria, a German declaration of war on Russia, and a French declaration of war on Germany. Thus began the First World War (1914).