Medieval scribes fill a volume called veterinarians with illustrations and descriptions of fantastic creatures. Manuscripts containing representations of these animals also relied on the beast zoo. These and other volume covers were made from calf, goat, sheep, deer and pig skins.

Most of these skins were removed before they were converted to book bindings. However, the medieval manuscript sets in northeastern France have a distinctive finish. The weathered cover is covered with hair.

Matthew Collins, a biofactorologist at the University of Copenhagen and Cambridge and author of the new study, said: However, it turns out to be difficult to pinpoint the source of hairy leather.

These furry books appear to be at home at the Hogwarts Library, but were originally written by Clairvaux Abbey, a hub of the Cistercians, the orders of the Catholic monk Ks. Founded in the Champagne Adennes region of France in 1115, the monastery was located in one of the largest monastery libraries in medieval Europe.

Approximately 1,450 volumes of the monastery’s extensive corpus survive. Approximately half of these manuscripts remain in the original, fragile bindings. Many were tied in Romanesque style in the 12th and 13th centuries, parchment was placed between wooden boards fixed with thread and cord.

At Clairvaux Abbey, these Romanesque books were often housed in secondary covers, bristled with fur. Traditionally, this creepy leather was thought to be made from wild boars and deer. However, the hair follicles of some manuscripts do not match the fur of either mammal.

Dr. Collins and his colleagues examined the hairy covers of 16 manuscripts once housed at Clairebaud Abbey. Researchers rubbed the sides of the leather meat with an eraser and carefully removed the crumb-sized sample. We then used various techniques to analyze the protein sequences and bits of the ancient DNA of leather.

Their findings published in the journal on Wednesday Royal Society Open Sciencereveals that the book is tied to seal skins, not to local land mammal skins. Some books are tied up in the skin of harbor seals, and at least one came from harp seals. Comparing them to modern DNA suggests that the origins of Scandinavian and Scottish seals, or as far as Iceland and Greenland.

These different territories were once connected by complex medieval trading networks. During the Middle Ages, Scandinavian traders harvested walrus ivory and fur from Greenland and sent them to mainland Europe. Clairebaud and his monks were far more inland from these coastal front posts, but the monastery was near a trafficked trade route.

The discoveries shed light on medieval society, according to Mary Wellesley, a fellow at the London Institute of Historical Studies, who specializes in medieval manuscripts and was not involved in new papers.

“The small details of the manuscript can tell you a lot about the world that created them,” Dr. Wellesley said. “It’s a common assumption that people didn’t move around, but these monasteries are part of this incredible network of goods, books and ideas.”

Seals were a valuable product for meat, dull, waterproof skin. This could be made into boots or gloves. Some records even claim that Sealskin was used to pay church taxes. Coastal communities in Scandinavian and Ireland used Sealskin to bind books, but this practice was far more unusual in the mainland Europe.

However, Cistercian monks apparently liked Sealskin’s books. Examples of these furry manuscripts have been found in other Abbeys, descendants of Clairevaux. These monks used this material to combine the most important documents, including historical information about the Cistercians, historical information about St. Bernard.

According to Dr. Collins, the fur color of the seal may explain the preference of the monks for using animal skins. The cover of the manuscript is now yellowish-gray or spotted brown, but was once wrapped in the white fur of a seal puppy. This shade matched the best of the monks’ dissatisfaction.

“In medieval Europe, you really don’t have anything white or white,” said Dr. Collins. “It must have been very magical.”

The seal itself appears to resemble the magical entity of the monk ks. In medieval veterinarians, seals are labelled “sea calves,” resembling dogs that have raised fish tails.