The knight of the sacred lake - Rosalind Miles

Camelot, and Arthur and Guenevere are holding a glittering feast to celebrate their knights of the Round Table. But amid the joy of the ceremony, one key figure is absent. Sir Lancelot du Lac has left court, sent away by Guenevere, who is tormented by a love for him she may neither honour nor deny.
But her efforts to bury her forbidden passion and commit herself again to Arthur are threatened by the malice of Morgan le Fay, hurself nursing an illicit love for Arthur. Now the proud mother of Arthur's only son, Morgan has also become the focus of Merlin's age-old quest to ensure the survival of the house of Pendragon. But unknown to all at Camelot, the old order is threatened by the determination of the Christians to destroy the worship of the Goddess, and secure the Sacred Hallows of Avalon for their own use.
As Guenevere struggles to reconcile duty and destiny, Lancelot is torn by conflicting loyalties to his Queen and King. Guenevere holds staunchly to her faith in her knight. But can she endure his absence, and the shattering news that she has a rival for his love?