In ancient Greek mythology, Lamia (Greek: Λάμια) was a beautiful queen of Libya who became a child-eating daemon. Aristophanes claimed her name derived from the Greek word for gullet (λαιμός; laimos), referring to her habit of devouring children.
In the myth, Lamia is a mistress of the god Zeus, causing Zeus' jealous wife, Hera, to kill all of Lamia's children (except for Scylla, who is herself cursed) and transform her into a monster that hunts and devours the children of others. Another version has Hera merely stealing away all of Lamia's children and it being Lamia herself, losing her mind from grief and despair, who starts stealing and devouring others' children out of envy, the repeated monstrosity of which transforms her into a monster on its own.
Some accounts say she has a serpent's tail below the waist. This popular description of her is largely due to Lamia, a poem by John Keats published in 1819. Antoninus Liberalis uses Lamia as an alternate name for the serpentine drakaina Sybaris; however, Diodorus Siculus describes her as having nothing more than a distorted face.
Later traditions referred to many lamiae; these were folkloric monsters similar to vampires and succubi that seduced young men and then fed on their blood.
In later stories, Lamia was cursed with the inability to close her eyes so that she would always obsess over the image of her dead children. Some accounts (see Horace, below) say Hera forced Lamia to devour her own children. Myths variously describe Lamia's monstrous (occasionally serpentine) appearance as a result of either Hera's wrath, the pain of grief, the madness that drove her to murder, or—in some rare versions—a natural result of being Hecate's daughter.
Zeus then gave her the ability to remove her eyes. The purpose of this ability is unclear in Diodorus, but other versions state Lamia's ability to remove her eyes came with the gift of prophecy. Zeus did this to appease Lamia in her grief over the loss of her children and to let her rest since she could not close her eyes