Prosymnus or Polymnus in Greek mythology

Greek mythology

Greek mythology is the body of myths and legends belonging to the ancient Greeks, concerning their gods and heroes, the nature of the world, and the origins and significance of their own cult and ritual practices. They were a part of religion in ancient Greece...

, was a shepherd living near the reputedly bottomless Alcyonian Lake, hazardous to swimmers, which lay in the Argolid, on the coast of the Gulf of Argos, near the prehistoric site of Lerna

Lerna

In classical Greece, Lerna was a region of springs and a former lake near the east coast of the Peloponnesus, south of Argos. Its site near the village Mili at the Argolic Gulf is most famous as the lair of the Lernaean Hydra, the chthonic many-headed water snake, a creature of great antiquity...

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When the wine god Dionysus

Dionysus

Dionysus was the god of the grape harvest, winemaking and wine, of ritual madness and ecstasy in Greek mythology. His name in Linear B tablets shows he was worshipped from c. 1500—1100 BC by Mycenean Greeks: other traces of Dionysian-type cult have been found in ancient Minoan Crete...

 went to Hades

Hades

Hades , Hadēs, originally , Haidēs or , Aidēs , meaning "the unseen") was the ancient Greek god of the underworld. The genitive , Haidou, was an elision to denote locality: "[the house/dominion] of Hades". Eventually, the nominative came to designate the abode of the dead.In Greek mythology, Hades...

 to rescue his mother Semele

Semele

Semele , in Greek mythology, daughter of the Boeotian hero Cadmus and Harmonia, was the mortal mother of Dionysus by Zeus in one of his many origin myths. In another version of his mythic origin, he is the son of Persephone...

, Prosymnus guided him to the entrance by rowing him to the middle of the lake. The reward demanded by Prosymnus for this service was the right to make love to Dionysus. However, when Dionysus returned to earth by a different route, he found that Prosymnus had meanwhile died. Dionysus kept his promise by carving a piece of fig wood into the shape of a phallus and used it to ritually fulfill his promise to Prosymus, while seated on his tomb. This, it is said, was given as an explanation of the presence of a fig-wood phallus among the secret objects revealed in the course of the Dionysian Mysteries

Dionysian Mysteries

The Dionysian Mysteries were a ritual of ancient Greece and Rome which used intoxicants and other trance-inducing techniques to remove inhibitions and social constraints, liberating the individual to return to a natural state. It also provided some liberation for those marginalized by Greek...

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This story is not told in full by any of the usual sources of Greek mythological tales, though several of them hint at it. It is reconstructed on the basis of statements by Christian authors; these have to be treated with reserve because their aim is to discredit pagan mythology.

Annual nocturnal rites took place at the Alcyonian Lake in classical times; Pausanias refuses to describe them.