Gavrilo Princip (Serbian Cyrillic: Гаврило Принцип, pronounced [ɡǎʋrilo prǐntsip]; 25 July [O.S. 13 July] 1894 – 28 April 1918) was a Bosnian Serb who assassinated Archduke Franz Ferdinand of Austria and his wife, Sophie, Duchess of Hohenberg, in Sarajevo on 28 June 1914. Princip and his accomplices were arrested and implicated by several members of the Serbian military, leading Austria-Hungary to issue a démarche to Serbia known as the July Ultimatum.