Lernaean Hydra. The Lernaean Hydra or Hydra of Lerna, more often known simply as the Hydra, is a serpentine water monster in Greek and Roman mythology.
   Its lair was the lake of Lerna in the Argolid, which was also the site of the myth of the Danaides. Lerna was reputed to be an entrance to the Underworld, and archaeology has established it as a sacred site older than Mycenaean Argos.
   In the canonical Hydra myth, the monster is killed by Heracles as the second of his Twelve Labors. According to Hesiod, the Hydra was the offspring of Typhon and Echidna.
   It had poisonous breath and blood so virulent that even its scent was deadly. The Hydra possessed many heads, the exact number of which varies according to the source.
   Later versions of the Hydra story add a regeneration feature to the monster: for every head chopped off, the Hydra would regrow two heads. Heracles required the assistance of his nephew Iolaus to cut off all of the monster's heads and burn the neck using sword and fire. The oldest extant Hydra narrative appears in Hesiod's Theogony, while the oldest images of the monster are found on a pair of bronze fibulae dating to c. 700 BCE. In both these sources, the main motifs of the Hydra myth are already present: a multi-headed serpent that is slain by Heracles and Iolaus. While these fibulae portray a six-headed Hydra, its number of heads was first fixed in writing by Alcaeus, who gave i
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