The Codex Gigas

The Codex Gigas is the largest extant medieval manuscript in the world. 

It is also known as the Devil's Bible because of a large illustration of the devil on the inside and the legend surrounding its creation. It is thought to have been created in the early 13th century in the Benedictine monastery of Podlažice in Bohemia (modern Czech Republic). 

It contains the Vulgate Bible as well as many historical documents all written in Latin. During the Thirty Years' War in 1648, the entire collection was taken by the Swedish army as plunder, and now it is preserved at the National Library of Sweden in Stockholm, though it is not normally on display.

About half of the Codex consists of the entire Latin Bible in the Vulgate version, except for the books of Acts and Revelation, which are from a pre-Vulgate version. 

They are in the order Genesis-Ruth; Isaiah-Daniel; Hosea-Malachi; Job; Samuel and Kings; Psalms-Song of Solomon; Wisdom of Solomon; Wisdom of Jesus; Esdras; Tobit; Judith; Esther; and Maccabees. Between the Testaments are Josephus' Antiquities of the Jews and De bello iudaico, as well as Isidore of Seville's encyclopedia Etymologiae and medical works of Hippocrates, Theophilus, Philaretus, and Constantinus. Following a blank page, the New Testament commences with Matthew-Acts, James-Revelation, and Romans-Hebrews. Following the picture of the devil, Cosmas of Prague's Chronicle of Bohemia, a list of brothers in the Podlažice monastery, and a calendar with necrologium, magic formulae and other local records round out the codex.

The entire document is written in Latin, in addition, it contains Hebrew, Greek, and Slavic alphabets (Cyrillic and Glagolitic). 

Legend has it the codex was created by a monk who sold his soul to the devil. 

The manuscript includes illuminations in red, blue, yellow, green and gold. Capital letters are elaborately illuminated, frequently across the entire page. The codex has a unified look as the nature of the writing is unchanged throughout, showing no signs of age, disease or mood on the part of the scribe. This may have led to the belief that the whole book was written in a very short time (see Legend). But scientists are starting to believe and research the theory that it took over 20 years to complete. 

Folio 290 recto, otherwise empty, includes a unique picture of the devil, about 50 cm tall. Several pages before this are written on a blackening parchment and have a very gloomy character, somewhat different from the rest of the codex. The reason for the different coloring is that when parchment is exposed to light it "tans", as parchment is made from animal skins, so over the centuries the pages that were exposed will have a darker color to them. Directly opposite the devil is a full picture of the kingdom of heaven, juxtaposing the "good versus evil," in contrast with the picture of the devil.