[Cumaean Sibyl was the most famous of the Sibyls, the prophetic old women of Greek mythology; she guided Aeneas through Hades in the Aeneid. She had been granted immortality by Apollo, but because she forgot to ask for perpetual youth, she shrank into withered old age and her authority declined.]
Not only the title, but the plan and a good deal of the incidental symbolism of the poem were suggested by Miss Jessie L. Weston's book on the Grail legend: From Ritual to Romance (Macmillan [Macmillan→Cambridge.]). Indeed, so deeply am I indebted, Miss Weston's book will elucidate the difficulties of the poem much better than my notes can do; and I recommend it (apart from the great interest of the book itself) to any who think such elucidation of the poem worth the trouble. To another work of anthropology I am indebted in general, one which has influenced our generation profoundly; I mean The Golden Bough; I have used especially the two volumes Adonis, Attis, Osiris. Anyone who is acquainted with these works will immediately recognise in the poem certain references to vegetation ceremonies.