After several years of work, this modern translation and re-edited version of the 13th century manuscript "The Book of the Grail" is introduced to all those who wish to follow the origin of the Arthurian legend in today's English. I have kept the language true to its original in every way possible, yet made it easier to understand for the contemporary reader. I have retitled it "The Holy Grail: The Knights of the Round Table." This composition is a prequel to my novel, "King Arthur: Sword in the Stone," the complete telling of the Grail legend, also available on Amazon. The novel chronicles the journeys of Percival, the greatest Knight of the Round Table, and interweaves the adventures of Lancelot and Gawain as they also rescue beautiful damsels and confront evil knights to rescue the Fisher King and attain the Holy Grail. The legend never lets you down as the knights travel through dark forests, visit mysterious castles, joust in tournaments, and meet hermits, crazed dwarfs, and good King Arthur who, in the beginning, has largely been abandoned by his knights. This is the original story that gave birth to all Arthurian works including The Lord of the Rings, Star Wars, Star Trek, The Mists of Avalon, The Idylls of the King, Le Morte de Arthur, Camelot, The Fisher King, and many other movies, novels, plays and musical.- Robert B. Gregg, 2016.