Franz Ferdinand, archduke of Austria-Este - Britannica
https://www.britannica.com/biography/Franz-Ferdinand-Archduke-of-Austria-Este
WebMar 4, 2024 · Franz Ferdinand, archduke of Austria-Este, Austrian archduke whose assassination was the immediate cause of World War I. He and his wife, Sophie, were murdered by the Serb nationalist Gavrilo Princip in Sarajevo on June 28, 1914, and a month later Austria declared war on Serbia.
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