Genesis of the Grail Kings by Laurence Gardner proposes that the Holy Grail is a divine bloodline, not a cup, tracing back to ancient Mesopotamian "Dragon Kings" and later Adam, Eve, and Jesus. Gardner alleges that this sacred lineage was genetically advanced via cloning, upholding a "grail code" of longevity and high-alchemy technology, which was suppressed by the church to establish a male-dominated society. The book blends genealogical research, esoteric history, and alternative interpretations of scripture to challenge mainstream historical and religious narratives.