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 Leopold Ferdinand of Austria Archduke Leopold Ferdinand of Austria Archduke Leopold Ferdinand of Austria (2 December 1868 – 4 July 1935) was the eldest son of Ferdinand IV, Grand Duke of Tuscany, and Alice of Bourbon-Parma. In 1892 and 1893 Leopold accompanied Archduke Franz Ferdinand of Austria on a sea voyage through the Suez Canal and on to India and Australia. The relationship between the two Archdukes was extremely bad and their permanent attempts to outdo and humiliate the other one led the "Kaiser" Franz Joseph to order Leopold Ferdinand to return to Austria immediately. He left the ship in Sydney and went back