Bulgaria during World War I 28 June 1914, Gavrilo Princip, a Bosnian-Serb student and member of Young Bosnia, assassinated the heir to the Austro-Hungarian throne, the Archduke Franz Ferdinand of Austria in Sarajevo, Bosnia. This began a period of diplomatic manoeuvring between Austria-Hungary, Germany, Russia, France and Britain called the July Crisis. Wanting to end Serbian interference in Bosnia conclusively, Austria-Hungary delivered the July Ultimatum to Serbia, a series of ten demands that were intentionally meant to be unacceptable in order to precipitate a war with Serbia. When Serbia acceded to only eight of the ten demands levied against it in the ultimatum, Austria-Hungary declared
Archduke Joseph Francis of Austria Archduke Joseph Francis of Austria Josef Franz, Archduke of Austria, Prince of Hungary (Josef Franz Leopold Anton Ignatius Maria; 28 March 1895 – 25 September 1957), was the eldest son of Archduke Joseph August of Austria and Princess Auguste Maria of Bavaria. As his father was the last Palatine of Hungary and was briefly considered a possible King of Hungary in 1919–1920, Josef Franz was a potential crown prince of Hungary. He was born during the reign of his maternal great-grandfather, Francis Joseph I of Austria, who was also his second cousin once removed on his father's side. On 4