CHT231128 Pythagoras (c.570-480 BC) (in the middle) teaching 8 other physicians including Galen (c.131-201) (bottom left) and Andromachus (bottom right), illustration from an arabic translation of \'De materia medica\' by Dioscorides (c.40-90) (vellum) by Islamic School, (13th century); Oesterreichische Nationalbibliothek, Vienna, Austria; (add.info.: Andromachus was physician to the Emperor Nero; Dioscorides was a botanist in Nero\'s army; Pherecydes of Syros (c.600-550 BC); Magnus (ancient Greek sage credited with the invention of theriac);); 穢 Archives Charmet; out of copyright.