On 28 June 1914, Archduke Franz Ferdinand of Austria, heir presumptive to the throne of Austria-Hungary was assassinated in Sarajevo by Gavrilo Princip – a Bosnian Serb member of Young Bosnia movement. The organisation, supported by the Black Hand, consisted of Yugoslavist nationalists advocating political union of Serbs, Croats, Slavic Muslims, and Slovenes through revolutionary actions. The July Crisis and outbreak of the First World War followed the assassination.