Archduke of Austria
From Tardis Wiki, the free Doctor Who reference
Franz Ferdinand was the Archduke of Austria, the heir to the Austrian throne who was assassinated in Sarajevo, Bosnia (PROSE: Human Nature) on 28 June 1914. (COMIC: The Dalek Project) Ferdinand's death led directly to the First World War, "through nations having treaties with nations", according to the Tenth Doctor. (TV: The Family of Blood)