Lamia (lamiai) were harmful spirits who killed infants & seduced sleeping men. One myth tells that the original Lamia was a beautiful queen of Libya, daughter of Belus and Libya, who won Zeus' heart. Hera became jealous of this union & retaliated by killing all her children who were fathered by Zeus. In anger and frustration, Lamia retreated to a cave where she unleashed her wrath by killing the offspring of human mothers, usually by sucking the blood of the children. These actions transformed Lamia's beauty into ugliness, but she was able to briefly regain her beauty to seduce men, & is said to have drunk their blood.