Doctors giving medicine.

Medieval Medical Books Could Hold the Recipe for New Antibiotics


For a long time, medieval medicine has been dismissed as irrelevant. This time period is popularly referred to as the “Dark Ages,” which erroneously suggests that it was unenlightened by science or reason. However, some medievalists and scientists are now looking back to history for clues to inform the search for new antibiotics.

The evolution of antibiotic-resistant microbes means that it is always necessary to find new drugs to battle microbes that are no longer treatable with current antibiotics. But progress in finding new antibiotics is slow. The drug discovery pipeline is currently stalled. An estimated 700,000 people around the world die annually from drug-resistant infections. If the situation does not change, it is estimated that such infections will kill 10 million people per year by 2050.

I am part of the Ancientbiotics team, a group of medievalists, microbiologists, medicinal chemists, parasitologists, pharmacists and data scientists from multiple universities and countries. We believe that answers to the antibiotic crisis could be found in medical history. With the aid of modern technologies, we hope to unravel how premodern physicians treated infection and whether their cures really worked.

Healing the sick, fresco by Domenico di Bartolo. Sala del Pellegrinaio (hall of the pilgrim), Hospital Santa Maria della Scala, Siena.

Healing the sick, fresco by Domenico di Bartolo. Sala del Pellegrinaio (hall of the pilgrim), Hospital Santa Maria della Scala, Siena. (Public Domain)

To that end, we are compiling a database of medieval medical recipes. By revealing patterns in medieval medical practice, our database could inform future laboratory research into the materials used to treat infection in the past. To our knowledge, this is the first attempt to create a medieval medicines database in this manner and for this purpose.

Bald’s Eyesalve

In 2015, our team published a pilot study on a 1,000-year old recipe called Bald’s eyesalve from “Bald’s Leechbook,” an Old English medical text. The eyesalve was to be used against a “wen,” which may be translated as a sty, or an infection of the eyelash follicle.

Human white blood cells (in blue) take on Staphylococcus aureus bacteria.

Human white blood cells (in blue) take on Staphylococcus aureus bacteria. (Frank DeLeo, National Institute of Allergy and Infectious Diseases)

A common cause of modern styes is the bacterium Staphylococcus aureus. Methicillin-resistant Staphylococcus aureus (or MRSA) is resistant to many current antibiotics. Staph and MRSA infections are responsible for a variety of severe and chronic infections, including wound infections, sepsis and pneumonia.

Bald’s eyesalve contains wine, garlic, an Allium species (such as leek or onion) and oxgall. The recipe states that, after the ingredients have been mixed together, they must stand in a brass vessel for nine nights before use.

In our study, this recipe turned out to be a potent antistaphylococcal agent, which repeatedly killed established S. aureus biofilms – a sticky matrix of bacteria adhered to a surface – in an in vitro infection model. It also killed MRSA in mouse chronic wound models.

Medieval Methods

Premodern European medicine has been poorly studied for its clinical potential, compared with traditional pharmacopeias of other parts of the world. Our research also raises questions about medieval medical practitioners. Today, the word “medieval” is used as a derogatory term, indicating cruel behavior, ignorance or backwards thinking. This perpetuates the myth that the period is unworthy of study.

This man's leg wound is being treated, while herbs for a soothing ointment or healing drink are being prepared.

This man's leg wound is being treated, while herbs for a soothing ointment or healing drink are being prepared. (The Knight with the Lion)

During our eyesalve study, chemist Tu Youyou was awarded the Nobel Prize in Physiology or Medicine for her discovery of a new therapy for malaria after searching over 2,000 recipes from ancient Chinese literature on herbal medicine. Is another “silver bullet” for microbial infection hidden within medieval European medical literature?

Certainly, there are medieval superstitions and treatments that we would not replicate today, such as purging a patient’s body of pathogenic humors. However, our work suggests that there could be a methodology behind the medicines of medieval practitioners, informed by a long tradition of observation and experimentation.

One key finding was that following the steps exactly as specified by the Bald’s eyesalve recipe – including waiting nine days before use – was crucial for its efficacy. Are the results of this medieval recipe representative of others that treat infection? Were practitioners selecting and combining materials following some “scientific” methodology for producing biologically active cocktails?

Further research may show that some medieval medicines were more than placebos or palliative aids, but actual “ancientbiotics” used long before the modern science of infection control. This idea underlies our current study on the medieval medical text, “Lylye of Medicynes.”

Middle-English leech-book, containing medical receipts, including some charms; a Latin-English Glossary of herbs; short tracts on urines, the cure of wounds, uses of herbs, etc

Middle-English leech-book, containing medical receipts, including some charms; a Latin-English Glossary of herbs; short tracts on urines, the cure of wounds, uses of herbs, etc. (Wellcome Images/CC BY 4.0)

A Medieval Medicines Database

The “Lylye of Medicynes” is a 15th-century Middle English translation of the Latin “Lilium medicinae,” first completed in 1305. It is a translation of the major work of a significant medieval physician, Bernard of Gordon. His “Lilium medicinae” was translated and printed continuously over many centuries, until at least the late 17th century.

The text contains a wealth of medical recipes. In the Middle English translation, there are 360 recipes – clearly indicated with Rx in the text – and many thousands more ingredient names.

As a doctoral student, I prepared the first-ever edition of the “Lylye of Medicynes” and compared the recipes against four extant Latin copies of the “Lilium medicinae.” This involved faithfully copying the Middle English text from the medieval manuscript, then editing that text for a modern reader, such as adding modern punctuation and correcting scribal errors. The “Lylye of Medicynes” is 245 folios, which equates to 600 pages of word-processed text.

Page from the Lilium medicinae.

Page from the Lilium medicinae. (Luna Imaging)

I loaded the Middle English names of ingredients into a database, along with translations into modern equivalents, juxtaposed with relationships to recipe and disease. It is very time-consuming to format medieval data for processing with modern technologies. It also takes time to translate medieval medical ingredients into modern equivalents, due in part to multiple synonyms as well as variations in modern scientific nomenclature for plants. This information has to be verified across many sources.

With our database, we aim to find combinations of ingredients that occur repeatedly and are specifically used to treat infectious diseases. To achieve this, we are employing some common tools of data science, such as network analysis, a mathematical method to examine the relationships between entries. Our team will then examine how these patterns may help us to use medieval texts as inspiration for lab tests of candidate “ancientbiotic” recipes.

Word cloud from the Lylye of Medicynes

Word cloud from the Lylye of Medicynes. Erin Connelly

In March, we tested a small portion of the database to ensure that the method we developed was appropriate for this data set. At present, the database contains only the 360 recipes indicated with Rx. Now that the proof-of-concept stage is complete, I will expand the database to contain other ingredients which are clearly in recipe format, but may not be marked with Rx.

We are specifically interested in recipes associated with recognizable signs of infection. With Bald’s eyesalve, the combination of ingredients proved to be crucial. By examining the strength of ingredient relationships, we hope to find out whether medieval medical recipes are driven by certain combinations of antimicrobial ingredients.

The database could direct us to new recipes to test in the lab in our search for novel antibiotics, as well as inform new research into the antimicrobial agents contained in these ingredients on the molecular level. It could also deepen our understanding of how medieval practitioners “designed” recipes. Our research is in the beginning stages, but it holds exciting potential for the future.

Top Image: Doctors giving medicine. Source: The Knight with the Lion

The article ‘Medieval Medical Books Could Hold the Recipe for New Antibiotics by Erin Connelly was originally published on The Conversation and has been republished under a Creative Commons license.

Comments

Most interesting article. Has anyone done something similar with ancient Chinese, Indian or Native American medicines?

Register to become part of our active community, get updates, receive a monthly newsletter, and enjoy the benefits and rewards of our member point system OR just post your comment below as a Guest.

Myths & Legends

Edgar Cayce (Credit: Edgar Cayce’s Association for Research and Enlightenment, Author provided)
For nearly 30 years I have returned to the famous “Sleeping Prophet” Edgar Cayce’s readings as a road map to try and piece together the complex origins of civilization and the creation of Homo sapiens. Cayce (March 18, 1877 – January 3, 1945) was an American Christian mystic born in Hopkinsville, Kentucky who answered questions on subjects as varied as healing, reincarnation, wars, Atlantis, and future events while in a trance state.

Human Origins

Edgar Cayce (Credit: Edgar Cayce’s Association for Research and Enlightenment, Author provided)
For nearly 30 years I have returned to the famous “Sleeping Prophet” Edgar Cayce’s readings as a road map to try and piece together the complex origins of civilization and the creation of Homo sapiens. Cayce (March 18, 1877 – January 3, 1945) was an American Christian mystic born in Hopkinsville, Kentucky who answered questions on subjects as varied as healing, reincarnation, wars, Atlantis, and future events while in a trance state.

Ancient Technology

Detail of a star chart dating to the Middle Kingdom.
The calendar is one of mankind’s most important inventions. Calendars allowed societies to organize time for religious, social, economic, and administrative purposes. The calendar, or rather, two sets of calendars, were invented by the ancient Egyptians. One of these was a lunar calendar, which was used mainly for the organization of religious festivals.

Ancient Places

Healing Temple of Aesculapius (Asklepios) by Robert Thom
In the ancient world, many cultures built elaborate temple complexes dedicated to their healer gods - Imhotep in Egypt and Asklepios in Greece for example. These gods were recognized as having the power to cure supplicants from a variety of ailments within sleep and sacred dreams. Those who desired healing might travel many hundreds of miles to reach such a temple

Our Mission

At Ancient Origins, we believe that one of the most important fields of knowledge we can pursue as human beings is our beginnings. And while some people may seem content with the story as it stands, our view is that there exists countless mysteries, scientific anomalies and surprising artifacts that have yet to be discovered and explained.

The goal of Ancient Origins is to highlight recent archaeological discoveries, peer-reviewed academic research and evidence, as well as offering alternative viewpoints and explanations of science, archaeology, mythology, religion and history around the globe.

We’re the only Pop Archaeology site combining scientific research with out-of-the-box perspectives.

By bringing together top experts and authors, this archaeology website explores lost civilizations, examines sacred writings, tours ancient places, investigates ancient discoveries and questions mysterious happenings. Our open community is dedicated to digging into the origins of our species on planet earth, and question wherever the discoveries might take us. We seek to retell the story of our beginnings. 

Ancient Image Galleries

View from the Castle Gate (Burgtor). (Public Domain)
Door surrounded by roots of Tetrameles nudiflora in the Khmer temple of Ta Phrom, Angkor temple complex, located today in Cambodia. (CC BY-SA 3.0)
Cable car in the Xihai (West Sea) Grand Canyon (CC BY-SA 4.0)
Next article