Why?
Multiple reasons.
Then as now, writers started with rough drafts—but that’s a discussion for later (a good one).
It’s challenging to write neatly in a codex (the binding distorts the page, so the page isn’t flat).
Humans make errors; you don’t want to mess up the whole 📖
Another factor: ‘writing support’ (= stuff for writing on) was *Not Cheap*.

This is particularly true of the most widespread support for medieval books—namely parchment. Parchment is specially-treated animal skin.

(📷: Finished parchment sheets on the frames used in making it)
For a large book, one sheet of parchment = one life (🐄/🐏/🐐).

To pick up a medieval parchment manuscript is to hold an entire herd in one hand.

📷1: A medieval manuscript taking an afternoon stroll.
📷2: Another medieval manuscript enjoying the early summer weather. 😏
That’s money, honey.

You aren’t going to slaughter 200 head of cattle, pay craftsmen for the WEEKS needed to turn each skin into parchment, bind all those *blank* sheets into a book, then stick it on a shelf until inspiration strikes.

[gif: “Dollar, dollar, bills y’all”]
Due to the foregoing (& other issues that we won’t get into here) medieval books were modular.
The fundamental unit of the medieval manuscript is the bifolium (plural: bifolia): a single sheet folded in half.
This [again, as a broad rule] is what scribes producing or contributing to books wrote upon.
Bifolia could be gathered together into ‘quires’ (📷 1), then stacked in order (📷 2), and sewn together and bound (📷 3) to create the kind of book we see Brienne of Tarth writing in

(but note how the leaves below *aren’t blank*)

[📷 2: @V_and_A]
[📷 3: @FitzMuseum_UK]
… or not. Many manuscripts were never finished, remaining in a state of ongoing or extended production—often deliberately (but that, too, is a discussion for another time).
Note that this subtopic is very complex and I’ve simplified radically in this section of the thread.

Nonetheless, as a medieval ‘scribe’, she would not be sitting down to write in a massive, bound, decorated (we’ll get to that 🙃) book.
A caveat: https://twitter.com/stephanielahey/status/1131048051336855552?s=21
You can follow @StephanieLahey.
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