The Graeae — the “Grey Sisters” or “Grey Ones” — were three ancient witches who shared between them a single eye and a single tooth, passing them from hand to hand. Born grey-haired and aged, they are among the strangest beings in Greek myth, and their one shared eye became the key to the slaying of Medusa.
The Grey Ones
The Graeae were sisters of the Gorgons, daughters of the old sea-deities Phorcys and Ceto. There were three of them (commonly named Deino, Enyo, and Pemphredo), and they were unusual among monsters: they were not born young and then aged, but were said to have been grey-haired from birth — old women from the very beginning, personifications of the white foam of the sea or of old age itself.
The Shared Eye and Tooth
Their defining and eerie feature was that, between the three of them, they possessed only a single eye and a single tooth, which they shared by passing from one sister to the next — one would use the eye to see while the others were blind, then hand it on. This meant that at the moment of the exchange, when the eye was passing between hands, all three were briefly blind. That instant of shared blindness was their one vulnerability.
The Theft by Perseus
The hero Perseus, on his quest to slay Medusa, needed information that only the Graeae possessed — the location of certain magical objects (or of the Gorgons themselves, or of the nymphs who guarded the winged sandals and cap of invisibility). So Perseus crept up on the Grey Sisters and waited for the moment when they passed the eye between them — then snatched it from the air. Holding their single eye hostage, blind and helpless, the Graeae were forced to give Perseus the information he sought before he would return their eye. Cleverness, again, defeating ancient power.
The Sisters of Shared Sight
The Graeae endure as one of mythology's most haunting and original images — three beings forced to share a single sense, eternally taking turns to see, eternally vulnerable in the instant of exchange. They embody a strange, dreamlike idea of dependency and shared perception, and their myth is a perfect small lesson in how a hero wins: not by strength, but by finding and seizing the exact moment of weakness.
Three sisters, one eye between them — and a hero who knew that the moment it changed hands, all three were blind.