One of the earliest mentions of an incubus comes from Mesopotamia on the Sumerian kings' list, ca. 2400, where the hero Gilgamesh's father is listed as Lilu (Lila). It is said that Lilu disturbs and seduces women in their sleep, while Lilitu, a female demon, appears to men in their erotic dreams. Two other demons appear as well: Ardat lili visits men by night and bears ghostly children from them. Irdu lili, is the male counterpart to Ardat lili. He visits women by night. These demons were originally storm demons. Because the etymology was interpreted wrongly, they were later seen as night demons. Also considered to be vampires which is another form of a demon that is said to drink blood from its victims.