Caduceus is a continuation of the older Indo-European dragon-slayer motif. Wilhelm Heinrich Roscher (1913) pointed out that the serpent as an attribute of both Hermes and Asclepius is a variant of the "pre-historic semi-chthonic serpent hero known at Delphi as Python", who in classical mythology is slain by Apollo. One Greek myth of origin of the caduceus is part of the story of Tiresias, who found two snakes copulating and killed the female with his staff. Tiresias was immediately turned into a woman, and so remained until he was able to repeat the act with the male snake seven years later.
Snake worship Laocoön and his two sons, Antiphantes and Thymbraeus. Another tradition states that Apollo sent the serpents for an unrelated offense, and only unlucky timing caused the Trojans to misinterpret them as punishment for striking the Horse. Olympias, the mother of Alexander the Great and a princess of the primitive land of Epirus, had the reputation of a snake-handler, and it was in serpent form that Zeus was said to have fathered Alexander upon her; tame snakes were still to be found at Macedonian Pella in the 2nd century AD (Lucian, "Alexander the false prophet") and at Ostia a bas-relief shows