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The present paper focuses on the person of distinguished scientist, the discoyerer of phenylketonuria, Iyar Asbjørn Fölling His life was presented, from his childhood on a proyincial farm to the main research conducted by Fölling and ńnally the awards and orders receiyed The researcher was positioned in the wider context of changes taking place in Norway after the recoyery of the country’s full soyereignty in 1905 Besides the most important achieyement, which was undoubtedly the discoyery of phenylketonuria in 1934, other research projects in which Fölling participated were also described, such as physical efńciency research, which also went down in the history of medicine The paper also includes little-known facts from the life of the scholar, such as his support giyen to the hero of the anti-Nazi moyement Ole Jacob Malm In answer to the question, sometimes asked, why the ńrst article of phenylketonuria was written in German, an own hypothesis has been presented