Serbian Campaign of World War I Serbia, Montenegro, and Greece. When Bulgaria attacked both Serbia and Greece on 16 June 1913, it lost most of its Macedonian region to those countries, and additionally the Southern Dobruja region to Romania and Adrianople (the present-day city of Edirne) to Turkey in the 33-day Second Balkan War, which further destabilized the region. On 28 June 1914, Gavrilo Princip, a Bosnian Serb student and member of a multi-ethnic organisation of national revolutionaries called Young Bosnia, assassinated Archduke Franz Ferdinand of Austria, the heir to the Austro-Hungarian throne, in Sarajevo, Bosnia. The political objective of the assassination was the independence of
Sophie, Duchess of Hohenberg and Archduke Franz Ferdinand. Through her grandmother's family, the Berchtolds, she is distantly related to former Austro-Hungarian foreign minister Count Leopold Berchtold and to Austrian conductor Nikolaus Harnoncourt. Cardinal Christoph Schönborn is a great-grandson of her niece, Marie Chotek. Sophie, Duchess of Hohenberg Sophie, Duchess of Hohenberg (; ; 1 March 1868 – 28 June 1914), was the wife of Archduke Franz Ferdinand of Austria, the heir to the Austro-Hungarian throne. Their assassination in Sarajevo sparked a series of events that eventually led to World War I. Sophie was born in Stuttgart as the fourth daughter of Count Bohuslav Chotek