Then there is "a great red dragon, having seven heads and ten horns, and seven crowns upon his heads" (12:3) who is about to "devour her child as soon as it was born" (12:4).
Then there is a description of "War in Heaven" of the angels against the dragon, and "the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him."