The Secret Biological Life of Medieval Manuscripts

For centuries, we have opened medieval manuscripts looking for words.

We study the handwriting. We translate the Latin. We examine illustrations and marginalia. We identify the author, the scribe, the monastery and the reader. We look at what someone deliberately placed on the page and try to understand what they wanted to tell us.

It turns out we may have been reading only half the book.

Researchers led by University College Dublin have recovered DNA from sheep pox virus preserved in the animal skins used to make medieval parchment. The findings, reported this week, allowed scientists to use manuscripts including the approximately 1,000-year-old York Gospels and the Corpus Glossary, one of the earliest English dictionaries, as biological evidence in reconstructing thousands of years of the virus's history.

The discovery transforms a manuscript from a historical document into something considerably stranger: a biological archive.

The words tell one history.

The material tells another.

The Second Text

Before paper became commonplace in Europe, books were frequently written on parchment made from the skins of animals including sheep, goats and cattle.

An animal therefore had a life before it became a page.

It lived somewhere. It ate. It encountered other animals. It was raised within an agricultural economy. It carried its own DNA, microorganisms and, sometimes, disease.

Then its skin was processed into parchment and eventually placed in a book.

Hundreds or even a thousand years later, some of that biological information can still be recovered.

Researchers detected sheep pox virus DNA on multiple parchment pages, providing evidence that infected animals were sometimes used in manuscript production. Surprisingly, traces of the virus were also found on parchment identified as calfskin and goatskin. Researchers say this could represent unusual cross-species infection or contamination during parchment production.

Either possibility tells us something about a world the manuscript's author never intended to record.

A monk copying scripture wasn't documenting livestock disease.

He did it anyway.

An Accidental Archive

This is what makes the discovery so fascinating.

Archives are normally intentional.

Governments preserve laws. Families preserve letters. Churches preserve records. Libraries preserve books. We decide something is information and attempt to carry it forward through time.

But material objects are constantly recording information without our permission or awareness.

A manuscript can tell us what a medieval person believed because of the words written upon it.

Its parchment may simultaneously tell us what diseases circulated among animals, which species were being raised, how skins were processed and potentially something about agricultural networks and trade.

The same object contains both human memory and environmental memory.

Scientists already knew parchment could preserve remarkable biological information. Earlier research on the York Gospels demonstrated that proteins and DNA recovered from parchment could reveal information about the animals used to construct the manuscript and even biological material accumulated during centuries of human handling.

The latest research pushes that idea further by showing that manuscripts can help reconstruct the history of pathogens.

Libraries may therefore contain biological records nobody knew they possessed.

What Else Have We Saved?

That raises an irresistible question.

What else is sitting inside the world's archives?

There are millions of parchment documents preserved in monasteries, libraries, museums, universities and private collections.

Researchers traditionally approached these objects primarily through history, language, theology and art.

Now genetics can read them too.

A manuscript whose written contents appear historically unremarkable could conceivably contain biological information unavailable anywhere else.

That changes what an archive is.

The value of an old book may no longer reside solely in who wrote it or what it says. Its physical materials can preserve evidence about the civilization surrounding its creation.

Agriculture.

Disease.

Animals.

Craftsmanship.

Trade.

Human touch.

Perhaps even environmental change.

And much of that information survived precisely because nobody knew it was there.

Reading Beyond Language

There is something almost poetic about this.

Human beings have spent thousands of years trying to preserve knowledge. We carved information into stone, pressed it into clay, painted it onto walls, copied it onto animal skins, printed it onto paper and eventually converted it into digital information.

We tend to think the message is the thing we deliberately recorded.

But sometimes the medium has been keeping its own records.

The York Gospels were created to preserve sacred text. The Corpus Glossary was created to preserve language. Neither was intended to become a database of ancient disease.

Yet centuries later, scientists can ask these objects questions their creators could never have imagined.

The manuscript has therefore become something more than a text.

It is simultaneously literature, artifact, animal, ecosystem and archive.

For a thousand years, we thought we were preserving the book.

Perhaps the book was preserving the world around it.

We simply hadn't learned how to read it yet.

AI DISCLOSURE: This article was substantially generated by OpenAI’s ChatGPT. The author selected the subject, directed the editorial angle and framing, and reviewed the resulting article, but the prose and structure of this version were primarily written by ChatGPT based on the author’s instructions and source material. It should therefore be understood as an AI-generated article produced under human editorial direction, rather than as a human-written article merely edited with AI.