In Greek mythology, Pemphredo (also Pephredo; Ancient Greek Πεμφρηδώ / Πεφρηδώ, "alarm") is one of the Graeae, the grey sisters who share a single eye and a single tooth. Hesiod names her beside saffron-robed Enyo as a fair-cheeked daughter of Phorcys and Ceto, grey from birth and sister of the Gorgons. Apollodorus and later handbooks place her in the Perseus episode in which the hero steals the sisters' shared eye to learn the way to Medusa.
Adapted from Wikipedia, "Graeae" · CC BY-SA 4.0
I.Family and names
The Graeae are daughters of the sea-deities Phorcys and Ceto and sisters of the Gorgons. Hesiod's Theogony names only two grey sisters — well-clad Pemphredo and saffron-robed Enyo — as fair-cheeked yet grey from birth. Apollodorus expands the trio by adding Deino (Δεινώ).
Hyginus, listing them as Phorcides, pairs Pemphredo and Enyo with Persis and remarks that "for this last others say Dino," preserving Deino/Dino as a recognized variant of the third sister.
II.Mythology
The Graeae took the form of old, grey-haired women and shared one eye and one tooth, which they passed among themselves. By stealing the eye while they were exchanging it, Perseus forced them to reveal either the whereabouts of Medusa or the objects needed to approach her, ransoming the eye for the information.
In Prometheus Bound the sisters are described as ancient maidens of swan-like aspect. Pemphredo has no separate adventure apart from this shared ordeal; her individuality rests on Hesiod's epithet "well-clad" and on her place in the two-name versus three-name roll of the grey sisters.
III.Homonyms
This atlas entry (pemphredo-graea) is the Graia Pemphredo/Pephredo, sister of Enyo and (in Apollodorus) Deino. The collective node graeae holds the two-name versus three-name dispute for the sisters as a group.