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.
Serpent Men ruled from behind the scenes for a time, but were again discovered, defeated, and cast out in a secret war. However, they later repeated this tactic. Soon, they added the front of a Snake Cult religion, which gained power and influence within Valusia while the Serpent Men used their abilities of disguise to murder or replace each reigning monarch. Their power is eventually broken by King Kull, formerly an Atlantean barbarian who had recently conquered Valusia, and the Pict Brule the Spear-Slayer, whose society was aware of the Serpent Men's infiltration. After the destruction of Valusia, the Serpent Men escaped