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Events on Friday 14 May 1734 1
1659 – 1734Georg Ernst Stahl (1659-1734)Died 14 May 1734, aged 74Stahl was a German chemist and physician who developed the phlogiston theory of combustion, which dominated chemical thought for most of the eighteenth century. He also served as personal physician to King Frederick William I of Prussia. His ideas were later overturned by Antoine Lavoisier's oxygen theory.