Mists of Avalon, Paperback/Marion Zimmer Bradley

A tragic tale of the rise and fall of Camelot seen through the eyes of Camelot's women: the devout Gwenhwyfar, Arthur's Queen; Vivane, High priestess of Avalon and the Lady of the Lake; above all, Morgaine, possessor of the sight, the wise, the wise-woman fated to bring ruin on them all.