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
Archduke Franz Ferdinand of Austria not normally appear in public beside him. She would not be allowed to ride in the royal carriage or sit in the royal box in theaters. The wedding took place on 1 July 1900, at Reichstadt (now Zákupy) in Bohemia; Franz Joseph did not attend the affair, nor did any archduke including Franz Ferdinand's brothers. The only members of the imperial family who were present were Franz Ferdinand's stepmother, Princess Maria Theresa of Braganza, and her two daughters. Upon the marriage, Sophie was given the title "Princess of Hohenberg" ("Fürstin von Hohenberg") with the style "Her Serene Highness" ("Ihre Durchlaucht").