Royal physician from Iulis (Cea) under Seleucus I of Syria who founded a school of anatomy in Alexandria.

He believed the nerves carry "nervous spirit" from the brain, where he had traced the sensory and motor nerves, and that the arteries carry "animal spirit" from the heart by the air from the lungs.

He was best known for having cured Seleucus son Antiochos from a certain death, by stating that the young man was in love with his stepmother Stratonice. Seleucus then let them marry, and Antiochos was cured.