In this controversial new book, Adrian Gilbert reveals the real reason why Charles married Diana and how, through her, the Royal Family was reconnected with the line of King Arthur, the guardians of the Holy Grail. It's a story which goes back to Mary, the mother of Jesus, and Joseph of Arimathea, to the real King Arthur, ruler of Glamorgan and Pendragon of all Britain.

Reinterpreting ancient sources in the light of recent discoveries, Gilbert takes the reader on a journey to Britain's mystical past: from Arthur to the fairy-tale wedding of Charles and Diana to the birth of Prince William on the summer solstice of 1982. He identifies the real Avalon, the location of the fabled Grail castle and the burial place of King Arthur. He also explains the significance of the Wars of the Roses, the wider role of Queen Elizabeth I, tracing other descendants of King Arthur and the early grail dynasty to the present time. He is able to show how not just Diana, the Princess of Wales, but also Sir Winston Churchill, were descended from the Holy Grail family of the Virgin Mary, revealing one of the greatest secrets of our time.