Orestes surrounded by the Erinyes.

The Erinyes were three sisters of hideous shape: they had large claws on their hands and feet, snakes for hair, and large batlike wings; in addition, they were outfitted with scourges or whips. Their purpose was to pursue and torment all evildoers for the rest of their life, swooping down on them with their weapons and claws and tearing at their flesh. It didn't matter where the evildoers were; the Erinyes would inevitably come and find them.

Their names were Alecto, Tisiphone, and Megaera.