The largest surviving medieval manuscript in the world. A Devil painted across an entire page. A legend of a condemned monk who made a bargain in the dark. The Codex Gigas is a powerful historical study of the manuscript known as The Devil's Bible, one of the most extraordinary books ever created in medieval Europe. Made in thirteenth century Bohemia, the Codex Gigas is famous for its immense size, its mysterious origins, its vast collection of sacred and scholarly texts, and its unforgettable full page portrait of the Devil. For centuries, it has been surrounded by stories of sin, punishment, supernatural authorship, missing pages, monastic secrecy, and forbidden knowledge. This book examines the Codex Gigas as both a real medieval object and a legend that has refused to die. Inside, readers will explore: The making of the world's largest surviving medieval manuscript The monastery, kingdom, and religious world that shaped it The complete Bible, histories, medical texts, exorcism material, and chronicles bound inside it The famous Devil portrait and why it still disturbs modern viewers The legend of the condemned monk and the supposed pact with the Devil The missing pages and the myths surrounding what they may have contained The manuscript's journey through Bohemia, imperial collections, war, fire, and Sweden The difference between historical evidence and occult imaginationWritten with depth, atmosphere, and scholarly care, The Codex Gigas reveals why this enormous book became one of the darkest and most fascinating relics of the Middle Ages. This is the story of a manuscript too large to ignore, too strange to forget, and too powerful to remain only a book.