Mercurius

Mercurius is the God of commerce. The guild of merchants honored Mercurius at his temple near the Circus Maximus on his festival, Mercuralia, on May 15. They also sprinkled themselves and their merchandise with sacred water in a ceremony at the Capena Gate. When Mercurius became identified with Hermes, he took on the duties of messenger of the Gods, Psychopompus who guides the souls of the dead through the Underworld, and God of sleep and dreams. He also became God of thieves and trickery, owing to a trick he had played on Apollo by stealing and hiding the Sun God's cattle. His serpent-twined staff, the caduceus, was originally a magician's wand for wealth (which may be why it is the symbol of the medical profession) but became identified later as a herald's staff. But Mercurius has many aspects, attributes, names and epithets...