On 28 June 1914, the heir to the Austro-Hungarian throne was assassinated on a visit to Sarajevo by a Serbian nationalist called Gavrilo Princip. The assassination set in motion the events that led to the outbreak of the First World War, one of the bloodiest conflicts in human history and a trauma that would bring down the Austro-Hungarian Empire, ending nearly eight centuries of Hapsburg rule and unleashing unrest across the European continent.