s a native of Carystus in Euboea (Cassius Iatros. Problem. Phys. § 58), the son of Chrysar or Chrysaor (o( to=u *Xru/saros or *Xrusa/oros), if the name be not corrupt (Galen, Explicat. Vocum Hippocr. s. v. *)Indiko/n, vol. xix. p. 105), and one of the followers of Herophilus. (Cels. De Medic. v. Praef. p. 81; Soran. De Arte Obstetr. 100.48. p. 101.)
He was physician to Ptolemy Philopator, king of Egypt, and was killed while in attendance on that prince, shortly before the battle of Raphia (B. C. 217), by Theodotus the Aetolian, who had secretly entered the tent with the intent to murder the king. (Plb. 5.81.)
He wrote several medical works, of which nothing remains but the titles, and a few extracts preserved by different ancient authors.
He was probably the first person who wrote a treatise on hydrophobia, which he called *Kuno/lussos. (Caelius Aurel. De Morb. Acut. 3.9, p. 218.)
In one of his works *Peri\ th=s *)Iatrikh=s *Genealogi/as On Medical Genealogy, he is said by Soranus, in