Mary the Mother of Jesus, Mary Magdalene, Mary of Bethany and her sister Martha have been among the women identified as having been key to the establishment of Christianity. Karen L. King, Harvard Professor of New Testament Studies and the History of Ancient Christianity, writes that the history of women in ancient Christianity has been almost completely revised in the last twenty years. Many more women are being added to the list of women who made very significant contributions in the early history of Christianity. The new history comes primarily from recent discoveries of biblical text that had been neglected through the ages.