Thrasyas

Thrasyas an eminent herbalist, a native of Mantineia in Arcadia, the tutor of Alexias, who is said to have been able to drink hellebore with impunity. He lived shortly before the time of Theophrastus, and therefore probably about the middle of the fourth century BC. (Theophrast. Hist. Plant. ix. 16. § 8; 17. §§ 1, 2.)

It is uncertain whether he is the same person who was the author of some medical formulae mentioned by Scribonius Largus (De Cormpos. Medicam. c. 208 (78)), and Aëtius(ii. 4. 57, iii. l. 65, pp. 415, 426).