{"id":106595,"date":"2026-09-01T23:10:00","date_gmt":"2026-09-02T03:10:00","guid":{"rendered":"https:\/\/bgodinspired.com\/?p=106595"},"modified":"2026-09-01T23:10:55","modified_gmt":"2026-09-02T03:10:55","slug":"medieval-manuscript-dna","status":"publish","type":"post","link":"https:\/\/bgodinspired.com\/index.php\/bible-resources\/bible-history\/medieval-manuscript-dna\/","title":{"rendered":"Medieval Manuscript DNA: What 91 Old Books Are Made Of"},"content":{"rendered":"<div class='booster-block booster-read-block'>\n                <div class=\"twp-read-time\">\n                \t<i class=\"booster-icon twp-clock\"><\/i> <span>Read Time:<\/span>9 Minute, 37 Second                <\/div>\n\n            <\/div><p>There is a small soft brush used in routine cervical screening. Plastic handle, fine bristles, nothing special about it. Someone worked out that you can drag one of those, completely dry, across a page written around the year 700 \u2014 and lift readable <strong>medieval manuscript DNA<\/strong> off it without leaving a mark on the page.<\/p>\n\n<p>That is what a research team did at Duke University&#8217;s David M. Rubenstein Rare Book &amp; Manuscript Library. They sampled 91 manuscripts. The books came from as far apart as England and Ethiopia, and they ranged from the late eighth century to the early twentieth.<\/p>\n\n<p>The results were not really about the writing. They were about what the writing was sitting on.<\/p>\n\n<h2>How you read medieval manuscript DNA without damaging the page<\/h2>\n\n<p>Start with a thing most people never think about: those pages are not paper. They are parchment, and parchment is skin. An animal&#8217;s hide, scraped clean, stretched on a frame, dried flat, cut to size.<\/p>\n\n<p>Skin holds cells. Cells hold DNA. So the page itself is biological material that has been sitting quietly in a library for centuries.<\/p>\n\n<p>The problem was never that the DNA was missing. It was that getting to it used to mean cutting a piece off. No librarian on earth is going to let you trim a corner from an eighth-century book, and they are right not to.<\/p>\n\n<p>The dry brush changes that. It picks up loose cellular material from the surface, the sample goes through modern sequencing, and out the other end comes enough of a mitochondrial genome to say which animal the page came from.<\/p>\n\n<p>The work was published in <em>Manuscript Studies<\/em>, the journal of the Schoenberg Institute for Manuscript Studies, with Tim Stinson of NC State University as corresponding author and Matthew Breen of NC State&#8217;s veterinary college as a co-author. Breen put the method plainly: &#8220;Cytology brushes can be used when dry and do an excellent job of harvesting cellular material without damaging the integrity of the artifact being sampled.&#8221;<\/p>\n\n<p>Nothing is destroyed. Nothing is even scratched. You brush a page and the book tells you what it used to be.<\/p>\n\n<div class=\"convertkit-form wp-block-convertkit-form\" style=\"\"><script async data-uid=\"6491fb8269\" src=\"https:\/\/bgodinspired.kit.com\/6491fb8269\/index.js\" data-jetpack-boost=\"ignore\" data-no-defer=\"1\" data-no-optimize=\"1\" nowprocket><\/script><\/div>\n\n\n<h2>The books turned out to be a map of local farming<\/h2>\n\n<p>Here is the first surprise. The species did not scatter randomly. They clustered by geography, and the clusters look exactly like agriculture.<\/p>\n\n<p>The English manuscripts were overwhelmingly sheep \u2014 around eighty percent of them. The Ethiopian material was mostly goat. Manuscripts from southern Europe came back as a mix of sheep, goat and cattle.<\/p>\n\n<p>Which makes sense the second you say it out loud. Nobody imported a hide to make a book. You wrote on whatever was standing in the field outside.<\/p>\n\n<p>So a manuscript is two records at once. It is the text somebody wanted to preserve, and it is an accidental census of what a region was raising in a particular century. A wool economy leaves sheep pages behind. A highland goat economy leaves goat pages behind.<\/p>\n\n<p>One manuscript returned a pig signal, which sounds like a strange page until you read the team&#8217;s own caution about it. They think it probably does not mean the parchment was pigskin. It may reflect a pig-derived glue or some other surface treatment applied to the book at some point in its life. That kind of caveat is worth noticing \u2014 it is a research team telling you where their own result gets soft.<\/p>\n\n<h2>The page that comes right after the goat<\/h2>\n\n<p>Then there is the detail that keeps rattling around in my head.<\/p>\n\n<p>In one twelfth-century Gospel manuscript, the scribes had been alternating deliberately between calfskin and sheepskin. That much the DNA shows clearly \u2014 this was not random stock being grabbed off a pile. Somebody was choosing.<\/p>\n\n<p>And sitting in the middle of that pattern is a single goatskin page. It lands immediately after a passage about a young goat.<\/p>\n\n<p>Now, be careful with this one, because the researchers were careful with it. They raise it as a possibility \u2014 that medieval scribes may have matched the animal skin to what the text was talking about. It is not a proven practice. Nobody can go and ask a twelfth-century scribe what they were thinking, and a single page is exactly the sample size where coincidence lives.<\/p>\n\n<p>But it is a real goatskin page, in a real deliberate pattern, in exactly the place you would put one if you were making a quiet joke that almost nobody would ever be in a position to catch.<\/p>\n\n<p>Nine hundred years later, a dry brush caught it.<\/p>\n\n<h2>What a book actually cost before printing<\/h2>\n\n<p>This is where the whole thing stopped being a science story for me.<\/p>\n\n<p>Every page began as a skin. Every skin began as an animal that had to be born, fed, kept alive through a winter, and then killed. A thin book is a few animals. A thick book is a lot of animals.<\/p>\n\n<p>I am not going to hand you a number, because the honest answer is that it varies enormously with the size of the page and the size of the book, and I would just be inventing precision. But the direction is not in doubt. A large hand-copied volume represented a serious share of somebody&#8217;s livestock.<\/p>\n\n<p>And that was only the raw material. Someone had to scrape and stretch and dry every sheet. Someone had to make the ink. Then a copyist sat down and moved a hand across every single letter, for months, by daylight and candlelight, with the errors and small drifts that come with doing anything by hand \u2014 which is a large part of <a href=\"https:\/\/bgodinspired.com\/index.php\/bible-resources\/why-do-bible-translations-disagree\/\">why translations of ancient texts disagree with each other<\/a> today.<\/p>\n\n<p>We know the copying held up better than people assumed, too. When <a href=\"https:\/\/bgodinspired.com\/index.php\/bible-resources\/bible-history\/dead-sea-scrolls-discovery-proved-bible-unchanged\/\">the Dead Sea Scrolls turned up in a cave near Qumran<\/a>, the biblical text in them came out remarkably close to what was already being read two thousand years later.<\/p>\n\n<p>So picture the trade. A family looks at a flock. That flock is food, clothing, trade, and the only savings account anybody has. And a decision gets made to turn a meaningful piece of it into pages.<\/p>\n\n<p>People have spent a long time arguing about whether that was a wise use of a herd. What is harder to argue with is the pattern itself \u2014 that across centuries and continents, in wool country and in goat country, human beings kept deciding that certain words were worth more than the animals. Belief in God has a long history of making people spend real, edible, countable wealth on things that could never feed anyone. The flocks are gone. The words are still here, and now they are cheap enough that most of us own several copies.<\/p>\n\n<h2>The unread copy on the shelf<\/h2>\n\n<p>Your copy is not made of anything that ever had to be fed. It is paper, or it is a screen, and it cost you nearly nothing.<\/p>\n\n<p>But it got to you along a chain of people who paid in animals, winters and eyesight to keep it moving. Somebody&#8217;s herd is standing behind the sentence you would read tonight if you opened it.<\/p>\n\n<p>That does not make a book worth reading. Plenty of expensive things are not. It just changes what is in your hand \u2014 from something ordinary that came free, into the end of a very long relay where every runner paid to carry it a little further.<\/p>\n\n<p>If yours has been sitting there unopened for a while, the barrier is usually not interest. It is not knowing where to start. Our free <a href=\"https:\/\/bgodinspired.com\/index.php\/my-bible-reading-plan\/\">Bible reading plan generator<\/a> will build you a plan around however many minutes you actually have \u2014 which, compared with a flock, is a low price.<\/p>\n\n<h2>Something to think about<\/h2>\n\n<p>Do you think that scribe put the goatskin page after the goat passage on purpose \u2014 or is it a coincidence that only looks clever from nine centuries away? There is no right answer here, and both readings say something interesting about people. Tell us which way you lean in the comments.<\/p>\n\n<div class=\"convertkit-form wp-block-convertkit-form\" style=\"\"><script async data-uid=\"6491fb8269\" src=\"https:\/\/bgodinspired.kit.com\/6491fb8269\/index.js\" data-jetpack-boost=\"ignore\" data-no-defer=\"1\" data-no-optimize=\"1\" nowprocket><\/script><\/div>\n\n\n<h2>If you want to share this<\/h2>\n\n<ul>\n<li>A dry brush, the kind used in routine screening, can now lift readable DNA off a manuscript written in the year 700 without damaging the page. Old books turn out to be made of sheep, goats and cattle \u2014 a hidden record of local farming. https:\/\/bgodinspired.com\/index.php\/bible-resources\/bible-history\/medieval-manuscript-dna\/<\/li>\n<li>In one twelfth-century manuscript, scribes alternated calfskin and sheepskin pages on purpose. A single goatskin page sits right after a passage about a young goat. Researchers say it may have been deliberate. Nine hundred years later, DNA caught it. https:\/\/bgodinspired.com\/index.php\/bible-resources\/bible-history\/medieval-manuscript-dna\/<\/li>\n<li>Before printing, every page of a book started as an animal that someone fed through a winter. Which means somebody looked at the family&#8217;s flock and decided a set of words was worth more than the livestock. The flocks are gone. The words are still here. https:\/\/bgodinspired.com\/index.php\/bible-resources\/bible-history\/medieval-manuscript-dna\/<\/li>\n<\/ul>\n\n<h2>Questions people are asking<\/h2>\n\n<h3>How do scientists get DNA from medieval manuscripts without damaging them?<\/h3>\n<p>Researchers use a dry cytology brush \u2014 the same soft brush used in routine cervical screening \u2014 and gently sweep the surface of the parchment page. The brush lifts loose cellular material without cutting, scraping or marking the page, and that material is then sequenced. A study of 91 manuscripts at Duke University&#8217;s David M. Rubenstein Rare Book &amp; Manuscript Library, published in the journal <em>Manuscript Studies<\/em>, used this method on books dating from the late eighth century to the early twentieth.<\/p>\n\n<h3>What are medieval manuscripts made of?<\/h3>\n<p>Medieval manuscripts are usually written on parchment, which is animal skin that has been scraped, stretched on a frame and dried flat \u2014 not paper. DNA testing of 91 manuscripts at Duke University found the species varied by region: English manuscripts were roughly eighty percent sheep, Ethiopian manuscripts were mostly goat, and manuscripts from southern Europe were a mix of sheep, goat and cattle, reflecting whatever livestock was raised locally.<\/p>\n\n<h3>Did medieval scribes match the animal skin to the text?<\/h3>\n<p>It is possible, but it is not established. In a twelfth-century Gospel manuscript examined at Duke University, DNA testing showed the scribes deliberately alternated between calfskin and sheepskin, and a single goatskin page appeared immediately after a passage mentioning a young goat. The researchers raised this as a possibility rather than a conclusion, since one page is far too small a sample to rule out coincidence.<\/p>\n\n<h3>How many animals did it take to make a hand-copied book?<\/h3>\n<p>There is no single figure, because it depends entirely on the size of the pages and the number of leaves in the book. What is certain is that each sheet of parchment came from one animal&#8217;s skin, so a large hand-copied volume required a substantial number of animals, plus the labour of preparing every sheet, making the ink, and copying every letter by hand over a period of months.<\/p>\n\n<h3>What is biocodicology?<\/h3>\n<p>Biocodicology is the study of the biological material preserved in books and manuscripts \u2014 the animal skin a page was made from, and potentially other biological traces left on it over time. It treats an old book as a physical artefact carrying its own history, separate from the text written on it, and it has grown quickly as sequencing has become sensitive enough to work with tiny, non-destructively collected samples.<\/p>        <div class=\"booster-block booster-reactions-block\">\n            <div class=\"twp-reactions-icons\">\n                \n                <div class=\"twp-reacts-wrap\">\n                    <a react-data=\"be-react-1\" post-id=\"106595\" class=\"be-face-icons un-reacted\" href=\"javascript:void(0)\">\n                        <img decoding=\"async\" src=\"https:\/\/bgodinspired.com\/wp-content\/plugins\/booster-extension\/\/assets\/icon\/happy.svg\" alt=\"Happy\" title=\"\">\n                    <\/a>\n                    <div class=\"twp-reaction-title\">\n                        Happy                    <\/div>\n                    <div class=\"twp-count-percent\">\n                                                    <span style=\"display: 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Here is what 91 old books were actually made of, and the one page that stands out.<\/p>\n","protected":false},"author":1,"featured_media":106594,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_wp_convertkit_post_meta":{"form":"-1","landing_page":"0","tag":"0","restrict_content":"0"},"footnotes":""},"categories":[3550,3485],"tags":[],"class_list":["post-106595","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bible-and-science","category-bible-history"],"_links":{"self":[{"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/posts\/106595","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/comments?post=106595"}],"version-history":[{"count":2,"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/posts\/106595\/revisions"}],"predecessor-version":[{"id":106597,"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/posts\/106595\/revisions\/106597"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/media\/106594"}],"wp:attachment":[{"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/media?parent=106595"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/categories?post=106595"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bgodinspired.com\/index.php\/wp-json\/wp\/v2\/tags?post=106595"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}