The Nemean lion (Greek, Λέων της Νεμέας (Léōn tēs Neméas); Latin: Leo Nemaeus) was a vicious monster in Greek mythology that lived at Nemea. It was eventually killed by Heracles. It could not be killed with mortal weapons because its golden fur was impervious to attack. Its claws were sharper than mortal swords and could cut through any armor.
The lion is usually considered to have been the offspring of Typhon (or Orthrus) and Echidna; it is also said to have fallen from the moon as the offspring of Zeus and Selene, or alternatively born of the Chimera. The Nemean lion was sent to Nemea in the Peloponnesus to terrorize the city.
Sources: Wikipedi -http://en.wikipedia.org/wiki/Nemean_lion