Leucosia was one of the Greek Sirens. The other sirens included Parthenope, Aglaopheme, Peisinoe, Thelxiepeia and Ligeia. The sirens lured sailors to the doom using their voices and music. They were given wings by Demeter in order to aid her in searching for Persephone (abducted by Hades), but were cursed by Demeter when they failed. Circe implies they are cannibals.