Iollas, Iolaus
or IOLAS (Ἰόλλας, Ἰόλαος, orἸόλας), a writer on materia medica, born in Bithynia, who was probably a contemporary of Heracleides of Tarentum, or a little anterior to him, in the third century B. C., as he is mentioned in company with him by Dioscorides. (De Mat. Med. i. Praef. vol. i. p. 2.) He is mentioned also by Celsus (De Medic. 5.22, p. 93), Pliny (Plin. Nat. 20.73, 76), Galen (De Antid. 1.2, vol. xiv. p. 7), St. Epiphanius (Adv. Haeres. 1.1. 3. p. 3.), and the scholiast on Nicander (Ther. 5.683), but nothing is known of the events of his life, nor are any of his writings preserved.
From William Smith (ed.), Dictionary of Greek and Roman Biography and Mythology. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.