Hera
Lamia is a queen of Libya whom Zeus was in love with. Hera was jealous of Lamia and turned her into a monster. When she was a monster, Lamia then killed her children. Another version of this story is that Hera killed Lamia's children and was then so sad that she turned into a monster. Hera also put a curse on Lamia. The curse was that Lamia could not close her eyes. Hera chose this curse because she wanted Lamia to always think about the picture of her dead children. Zeus then gave Lamia the gift of being able to take her eyes out, so that she could rest. She could then put them back in again afterwards.