Graeae

Three grey haired female watchers for the gorgons, with one movable eye and one tooth between the three.

-Tomhas Bulfinch's description of the Graeae.

The Graeae, also known as the stygian witches or the grey sisters, were three grey haired hag-like sisters in greek mythology. They were the children of the elemental gods Phorcys and Ceto, but they had no godly power. Instead, they had grey hair, empty eye sockets, and toothless mouths from birth. They were the sisters of the gorgons. Because of their lack of godlyness, the Graeae were given jurisdiction over a swamp.