Who fulfills the witches' prophecy of not being "born of a woman"?

Macduff fulfills the witches' prophecy of not being "born of a woman", as he was delivered through a cesarean section. This is during the part of the novel where the witches are telling Macbeth to watch out for Macduff, but being a tragedy Macbeth is led to his own downfall and still makes contact with Macduff.