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Henri Joannes Maria Claessen (30 November 1930 – 26 July 2022) was a Dutch cultural anthropologist who specialised in the early state. He was Professor Emeritus in Social Anthropology at Leiden University,[1] as well as an honorary member of several scholarly institutions (Koninklijk Instituut voor Taal-, Land- en Volkenkunde [Royal Institute for Languages and Anthropology of the Royal Academy of Sciences]); Center for Asian and Pacific Studies (University of Nijmegen); Honorary Lifetime Member of the IUAES (International Union of Anthropological and Ethnological Sciences).