A landmark exploration of the Holy Grail legend, tracing its Celtic roots, medieval transformations, and enduring spiritual symbolism across Western tradition. The legend of the Holy Grail-one of the most enduring symbols of Western European literature-has inspired centuries of myth, poetry, and spiritual reflection. In this landmark study, Alfred Nutt examines the historical sources, literary traditions, and cultural influences that shaped the Grail narrative from its earliest appearances in medieval romance to its lasting place in the Arthurian imagination. Drawing on the works of Chrétien de Troyes, Wolfram von Eschenbach, Robert de Boron, and other foundational writers, Nutt traces the evolution of the Grail story across Celtic mythology, Christian symbolism, Eastern tradition, and alchemical thought. His analysis reveals how the Grail quest expresses a universal human search for meaning, redemption, and transcendence. Erudite yet accessible, this classic work of medieval literary scholarship remains essential for readers interested in Arthurian literature, comparative mythology, medieval history, and the spiritual symbolism of the Grail tradition.