Gavrilo Princip was a Bosnian Serb member of Young Bosnia, a Yugoslavist organization seeking an end to Austro-Hungarian rule in Bosnia and Herzegovina. He assassinated Archduke Franz Ferdinand of Austria and his wife, Sophie, in Sarajevo on 28 June 1914, initiating a chain of events that would lead to the outbreak of World War I. Princip and his accomplices were arrested and implicated the Serbian nationalist secret society known as the Black Hand, leading Austria-Hungary to issue a démarche to Serbia known as the July Ultimatum.Princip said the archduke was targeted because "as future Sovereign he would have prevented our union by carrying through certain reforms", an allusion to the archduke's reputed support for structural reforms of the monarchy that would assign more autonomy to the Slavic lands. This was a threat to the Serbian irredentist project.
Princip was a Yugoslav nationalist associated with the movement Mlada Bosna which predominantly consisted of Serbs, but also Bosniaks and Croats. During his trial he stated: "I am a Yugoslav nationalist, aiming for the unification of all Yugoslavs, and I do not care what form of state, but it must be freed from Austria."Princip died on April 28, 1918, from tuberculosis caused by poor prison conditions that had cost him a limb earlier.
Said to the prison warden on being moved to another prison; as quoted by Borivoje Jevtic (1914) http://wwi.lib.byu.edu/index.php/The_Assassination_of_Archduke_Franz_Ferdinand
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