Franz Joseph I of Austria the Empire on 6 October 1908. However a diplomatic crisis erupted, as both the Serbs and the Italians demanded compensation for the annexation, which the Austro-Hungarian government refused to entertain. The incident was not resolved until the revision of the Treaty of Berlin in April 1909, exacerbating tensions between Austria-Hungary and the Serbs. On 28 June 1914 Franz Joseph's nephew and heir Archduke Franz Ferdinand, and his morganatic wife Sophie, Duchess of Hohenberg, were assassinated by Gavrilo Princip, a Yugoslav nationalist of Serbian ethnicity, during a visit to Sarajevo. When he heard the news of the assassination, Franz Joseph said
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