A codex (Latin for block of wood, book; plural codices) is a handwritten book, in general, one produced from Late Antiquity through the Middle Ages. The scholarly study of manuscripts from the point of view of the bookmaking craft is called codicology. The study of ancient documents in general is called paleography.
New World codices were written as late as the sixteenth century (see Maya codices and Aztec codices).
The codex was an improvement upon the scroll, which it gradually replaced as the written medium. The codex in turn was replaced by the printed book.
In Western culture the codex gradually replaced the scroll. From the fourth century, when the codex gained wide acceptance, to the Carolingian Renaissance in the eighth century, many works that were not converted from scroll to codex were lost to posterity. The codex was an improvement over the scroll in several ways. It could be opened flat at any page, allowing easier reading; the pages could be written on both recto and verso; and the codex, protected within its durable covers, was more compact and easier to transport.
The codex also made it easier to organize documents in a library because it had a stable spine on which the title of the book could be written. The spine could be used for the incipit, before the concept of a proper title was developed, during medieval times.
Although most early codices were made of papyrus, papyrus was fragile and supplies from Egypt, the only place where papyrus grew, became scanty; the more durable parchment and vellum gained favor, despite the cost.
The codices of pre-Columbian Mesoamerica had the same form as the European codex, but were instead made with long folded strips of either fig bark (amatl) or plant fibers, often with a layer of whitewash applied before writing.
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