Franz Ferdinand was an Archduke of Austria-Este and Royal Prince of Hungary and Bohemia. His assassination in Sarajevo precipitated Austria-Hungary's declaration of war against Serbia which caused countries allied with each other to enter into what became World War I.
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Gavrilo Princip: A Bosnian Serb member from Young Bosnia who assassinated Archduke Franz Ferdinand.
Black Hand: The secret military society involved in the assassination of Franz Ferdinand.
Triple Entente: An alliance between France, Russia, and Britain that was formed in response to the Triple Alliance. It played a significant role in World War I.