Franciscus Sylvius (Dutch: [frɑnˈsɪskʏs ˈsɪlvijʏs], Ecclesiastical Latin: [franˈtʃiskus ˈsilvi.us]; born Franz de le Boë;Dutch pronunciation: [frɑns də lə bo.ə] 15 March 1614 – 19 November 1672) was a Dutch physician and scientist (chemist, physiologist and anatomist) who was an early champion of Descartes', Van Helmont's and William Harvey's work and theories. He was one of the earliest defenders of the theory of circulation of the blood in the Netherlands, and commonly falsely cited as the inventor of gin – others pinpoint the origin of gin to Italy.
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