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- A codex is the historical ancestor of the modern book, constructed by folding sheets of writing material into quires and stitching them together at the spine.
- The word 'codex' derives from the Latin 'caudex', originally referring to a wooden block or tree trunk, reflecting its evolution from hinged wooden writing tablets.
- Before the codex, the primary format for preserved written texts in the Mediterranean and Near East was the continuous papyrus or parchment scroll (volumen).
- A scroll was manufactured by gluing individual rectangular sheets of Egyptian papyrus together horizontally, forming continuous rolls that often measured 8 to 10 metres in length.
- The foremost mechanical advantage of the codex over the scroll was 'random access'—the ability to jump directly to any page without unrolling sequential text.
- Reading a scroll was physically demanding, requiring both hands to hold, unroll, and rewind the text, making simultaneous note-taking or cross-referencing impractical.
- The codex permitted writing on both sides of a leaf (the front side called 'recto' and the back side called 'verso'), effectively doubling text capacity.
- Scrolls were typically written on only one side ('anopistograph') because the outer surface was exposed to handling friction and damage during rolling.
- Individual folded booklets that make up a codex are called 'quires' or 'gatherings', typically created by folding four sheets of parchment together into eight leaves (a quaternion).
- Rigid wooden boards or leather covers on a codex protected internal pages from dust, light, moisture, and tearing, making it far more durable than a roll.
- Roman authors in the first century CE, such as the poet Martial, first praised parchment codices for their compactness and convenience during travel.
- Early Christian communities in the 2nd and 3rd centuries CE were decisive early adopters of the codex format for copying biblical scriptures and liturgical writings.
- Adopting the codex allowed Christians to bind all four Gospels and the Pauline epistles into a single portable volume, distinguishing their scriptures from Jewish scrolls.
- Roman legal scholars also favored the codex because extensive statutory collections could be referenced quickly during courtroom proceedings.
- The complete transition occurred between the 3rd and 5th centuries CE; by 400 CE, the codex format accounted for the overwhelming majority of surviving classical and Christian literature.
- Codex Sinaiticus and Codex Vaticanus, both dating to the mid-fourth century CE, represent the oldest surviving nearly complete manuscripts of the Christian Bible.
- Parchment (processed calf, sheep, or goat skin) became the preferred material for codices because its strength withstood repetitive page turning better than brittle papyrus.
- Indigenous civilizations of Mesoamerica independently developed accordion-folded screenfold books on fig-tree bark paper, also designated by historians as Mesoamerican codices.
- The codex format facilitated the development of modern textual apparatus, including tables of contents, page numbers, running headers, indices, and marginal commentaries (scholia).
- When Johannes Gutenberg developed movable type printing in Mainz around 1450, he adapted the physical architecture of the codex directly into the modern printed book.
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