The Nemean lion was a vicious monster 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...

 that lived at Nemea. It was eventually killed by Heracles

Heracles

Heracles ,born Alcaeus or Alcides , was a divine hero in Greek mythology, the son of Zeus and Alcmene, foster son of Amphitryon and great-grandson of Perseus...

. 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

Typhon

Typhon , also Typhoeus , Typhaon or Typhos was the last son of Gaia, fathered by Tartarus, and the most deadly monster of Greek mythology. He was known as the "Father of all monsters"; his wife Echidna was likewise the "Mother of All Monsters."Typhon was described in pseudo-Apollodorus,...

 (or Orthrus

Orthrus

In Greek mythology, Orthrus or Orthus was a two-headed dog and a doublet of Cerberus, both whelped by the chthonic monsters Echidna and Typhon.He was owned by the three-bodied giant, Geryon...

) and Echidna

Echidna (mythology)

In Greek mythology, Echidna was half woman half snake, known as the "Mother of All Monsters" because most of the monsters in Greek myth were mothered by her...

; it is also said to have fallen from the moon as the offspring of Zeus

Zeus

In the ancient Greek religion, Zeus was the "Father of Gods and men" who ruled the Olympians of Mount Olympus as a father ruled the family. He was the god of sky and thunder in Greek mythology. His Roman counterpart is Jupiter and his Etruscan counterpart is Tinia.Zeus was the child of Cronus...

 and Selene

Selene

In Greek mythology, Selene was an archaic lunar deity and the daughter of the Titans Hyperion and Theia. In Roman mythology, the moon goddess is called Luna, Latin for "moon"....

, or alternatively born of the Chimera

Chimera (mythology)

The Chimera or Chimaera was, according to Greek mythology, a monstrous fire-breathing female creature of Lycia in Asia Minor, composed of the parts of multiple animals: upon the body of a lioness with a tail that ended in a snake's head, the head of a goat arose on her back at the center of her...

.