In 1669, Dionis was surgeon of the King and chirurgien par quartier of the Queen Maria Theresa.
[note 1] On 31 July 1671, the King Louis XIV appointed François Cureau de La Chambre as a Démonstrateur opérateur pour l’intérieur des plantes[note 2] of the Botanical Garden (Jardin des Plantes).
[1][2] He was appointed surgeon by Louis XIV in 1672 to teach at the Jardin des Plantes “anatomy according to the circulation of the blood”, while the Faculty of Medicine in Paris contested William Harvey's discovery of blood circulation.
Louis XIV had sided with the Moderns of the Garden against the Ancients of the Faculty.
[3] His work, "L'anatomie de l'homme suivant la circulation du sang et les dernières découvertes" (The anatomy of man according to the circulation of the blood and the latest discoveries), 1690, was a prodigious success and was even translated into Tartar.