Parchments discovered in Egypt led Margarita Torres Sevilla and José Miguel Ortega del Río on a three-year investigation as they traced the Holy Grail's journey across the globe to its possible resting place in the Basilica of San Isidoro in León, Spain. Discussing Christendom's foremost relic from the Last Supper through the present, this detailed history explores the importance of the Grail in relation to the Early Church, the Crusades, and the Arthurian legends.