 The mythographer Pherecydes of Athens (5th century BC) has Echidna as the daughter of Phorcys, without naming a mother.Other authors give Echidna other parents.According to the geographer Pausanias (2nd century AD), Epimenides (7th or 6th century BC) had Echidna as the daughter of the Oceanid Styx (goddess of the river Styx) and one Peiras (otherwise unknown to Pausanias), while according to the mythographer Apollodorus (1st or 2nd century AD), Echidna was the daughter of Tartarus and Gaia.