The Graeae Picture

Born old and having to share a single eye and tooth, Deino, Pemphredo, and Enyo were triplets who guarded either the location of or how to defeat their other sisters the three Gorgons. The hero Perseus, on a quest to kill Medusa, forced the answer out of the Graeae by stealing their eye and tooth.

Not to be confused with yet another (but entirely unrelated) trio of sisters, the Moirae (or Fates).
Continue Reading: The Fates