Dioscoride dans les Simples de Galien

“Dioscorides in Galen’s Simples”. In the 2nd century CE, despite the large number of works available on materia medica, Galen decided to compose the treatise "On Simple Drugs". While most of these works are now lost, Dioscorides’ "De materia medica" has survived the great loss of classical texts maybe because of its high quality and complementarity with the "Simples". In the first part of this study, we will collect all the passages from the "Simples" which explicitly refer to Dioscorides and we will study the posture that Galen adopts towards his great predecessor. How does he justify the composition of the umpteenth pharmacological treatise and by what strategies does he try to establish himself as the new authority in pharmacology? In the second part, we will analyze how and to what extent Galen reproduces the contents of the "De materia medica" in his treatise on simple drugs.