|The Holy Grail by Malcolm Godwin
This book traces the evolution of the Grail myth from its inception as a Celtic fertility cycle concerned with rightful kingship and Sovereignty with the land, to its metamorphosis into a Christian myth designed to hide the worship of the Holy Mother (Goddess) Mary, and finally as it transformed, yet again, into an alchemical parable on how to conduct life, that would have pleased any Taoist. Aside from the fact that the Grail cycle has at its foundations the births of King Arthur and sometimes Christ, (two very important Solstice births from two distinct religious traditions) the legend itself is concerned with regrowth, renewal, and regeneration, which, at the time of the season’s turning from its darkest hour to the gaining power of the light, is highly relevant.
On a related note, Jessi L. Weston's From Ritual To Romance also traces the history of the Aurthurian saga, and relates the Holy Grail myth back to the vegetative, regenerative cults of the sacrificial Solstice deities. A review of this volume can be found on this page.