Lady of Avalon (Avalon, Book 3) by Marion Zimmer Bradley

Caillean, the young priestess fated to become Lady of Avalon, who rescues and raises the orphaned Gawen—heir to a mystic and dangerous royal line...Dierna, who must use all her strength, wisdom, and love to guide Avalon through treacherous political waters and veil the island from a hostile world...Viviane, Lady of the Lake and keeper of the Grail, destined for true greatness as she prepares Avalon for the coming of a legendary king...

Bestselling author Marion Zimmer Bradley brings the mesmerizing world of myth and magic, romance and history, brilliantly to life in this novel of epic grandeur worthy of fantasy’s finest storyteller.