A Mortal, one of three Gorgons (a race of warlike women living in Libya), snake-haired and tusked mentioned in in Greek mythology. When she was killed by Perseus, her two children by Poseidon, Pegasus and Chrysaor sprang from her corpse. Pegasus, who had the form of a winged horse, was ridden by Bellerophon who killed Chimera.

sources:

http://www.artsmia.org/mythology/slide12.html
http://www.entrenet.com/~groedmed/greekm/mythmedu.html
http://www.artsmia.org/mythology/slide12.html