Mists of avalon, paperback/marion zimmer bradley

A tragic tale of the rise and fall of Camelot seen through the eyes of Camelots women: the devout Gwenhwyfar, Arthurs 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.