Crateuas was the personal physician of Mithridates VI. Of Pontos. He wrote a three-part herbal book describing the medicinal properties of plants. This work, which was illustrated, is the earliest known herbal book to include illustrations. The text was one of the main sources used by Dioscorides. Of Krateuas's work only two papyrus fragments have survived. ^[2] Digital facsimile of the Wellmann edition from the Internet Archive at this link.