Graeae

[2][3] They were the daughters of the primordial sea gods Phorcys and Ceto and, among others, sisters of the Gorgons and the Hesperides.

The Graeae are best known from their encounter with Perseus, who, after capturing their eye, forced them to reveal information about the Gorgons.

[4] The Graeae were daughters of the sea-deities Ceto and Phorcys (from which their name the Phorcydes derived) and sisters to the Gorgons.

[8] Calling them "Phorcides", Hyginus, in addition to Pemphredo and Enyo, adds Persis, noting that "for this last others say Dino".

By stealing their eye while they were passing it among themselves, the hero Perseus forced them to tell the whereabouts of the three objects needed to kill Medusa (in other versions, the whereabouts of Medusa) by ransoming their shared eye for the information.