Who is the Virgin Huntress in the novel, The Mists of Avalon?

Morgaine is the Virgin Huntress.

Maiden Huntress can enchant the deer—then he will become the Horned One, the King Stag, consort of the Virgin Huntress, crowned with the antlers of the God. Morgaine, I told you years ago that your maidenhood belongs to the Goddess. Now she calls for it in sacrifice to the Horned God. You are to be the Virgin Huntress, and the bride of the Horned One. You have been chosen for this service.”