according to Milton, is twinkeeper with Death of the gates of Hell. She sprang full-grown from the head of Satan.
... Woman to the waist, and fair, But ending foul in many a scaly fold Voluminous and vast, a serpent armed With mortal sting.
Paradise Lost. ii. 650-653. Original sin. (See Adam.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894