Medusa

Medusa is African - she is the power in the west of the Mediterranean as Poseidon is in the east.

The sea god's name on the African side of the Mediterranean is Yamm in Libya and Egypt.

Medusa is wisdom, holiness, love, passion, nobility, pride, beauty; power, independence, defiance, strength of will,
clash with authority, rage, punishment, disfigurement, anger, depression, vengeance, hypnosis (hip gnosis),
 secrecy, mystery.  She is a fertile Earth goddess of both surface world and Underworld, a protective mother to humans
and animals alike, hostile to thieves and invaders.  Medusa is part of a close and loyal sisterhood of family and priestesses;
she can also be connected to islands close to the coast (earth held in the embrace of the sea god).  Masks were likely used for Gorgonic rites.  Medusa remained an apotropaic symbol of protection and repulsing evil for centuries throughout the
Mediterranean world.  Her gaze and grinning boar tusked face decorated many temples and city walls.

Her father was Phorcys (another sea god, maybe a seal god) and her mother was Keto, as in Phoenician Der-keto.
 (Cetus is the sea monster or whale in the same quadrant of the sky that Pegasus and Andromeda are in.)  The Gorgon
sisters had 'monstrous' primeval siblings, too.  They include the Echidna, Ladon, Scylla, and the Graeae, another triplicity
of oracular sisters, among others.  Here is the Theoi website link: http://www.theoi.com/Pontios/Phorkys.html

from the writings of Alcman, Fragment 1 (trans. Campbell, Vol. Greek Lyric II) (Greek lyric C7th B.C.) :
"Let no man . . . attempt to marry . . . a daughter of Phorkos."