Mormo was a spirit in Greek and Roman mythology that was said to bite children. Caretakers used to scare children with stories about Mormo trying to convince them not to misbehave or Mormo would come and bite them.
Mostly Mormo was referred as a female figure resembling a vampire and the concept of Mormo seems to have been personalized by the time while it was a much more general definition in the ancient ages. Mormo was known as the consort of goddess Hecate, the goddess of witchcraft, magic and moon.
Aristophanes and Hippolytus of Rome referred to Mormo in their literary works, however, Mormo’s historical importance and place in the mythology faded away with time compared to the ancient times when she was respected and worshipped by a cult.