Sint-Truiden Abbey was founded in the 7th century by Saint Trudo (c. 630–693), who, after his training in Metz, returned home and established a religious community. This community grew into an abbey that adopted the Rule of Saint Benedict in the 9th century and lay at the origin of the later city of Sint-Truiden. 

From the 10th century onwards, the abbey developed into one of the richest and most influential in the Southern Netherlands, thanks to its landholdings and significant income from pilgrimages. With its library and scriptorium, it also became an important center of knowledge and culture. 

A prominent figure in this history was Abbot Rodulphus (1070–1138), author of the Gesta Abbatum Trudonensium and founder of the scriptorium. During the heyday of the 11th and 12th centuries, Abbot Wiric also contributed to strengthening and beautifying the monastery. In the 13th century, William of Brussels fostered administrative and economic development. 

After a long period alternating between prosperity and decline, the abbey experienced a final major revival under Abbot Jozef van Herck (1751–1780). The medieval complex was almost completely renovated in an impressive neoclassical style. 

The French Revolution brought an end to the abbey. In 1797, it was suppressed, its property was sold, and the manuscripts from its library were scattered, reaching as far as the United States... 

The abbey as a center of knowledge

When we think of an abbey today, we might mostly picture silence, prayer, and ancient walls. In the Middle Ages, abbeys were much more than that. They were the knowledge centers of their time, where people studied, wrote, made music, and where knowledge was gathered, preserved, and passed down. 

Saint Trudo Abbey also played this role for centuries and likely had an organized educational program as early as the 8th century. Long before the emergence of universities, these abbeys—alongside chapter and cathedral schools—were the main centers of learning of their era. They held knowledge that remained inaccessible to most of the population. 

In the 11th century, the abbey housed a school, a library, and a scriptorium where monks copied and studied books with angelic patience. Thanks to contacts with other abbeys and schools in the Meuse region, not only people traveled from one community to another, but also ideas, texts, and manuscripts. 

Not everything has survived. Wars and fires took their toll; some works quietly disappeared, while others were treasurably preserved and copied over the centuries. Abbeys did not merely store knowledge; they also determined which knowledge would endure through the ages. 

The collection of Saint Trudo Abbey reveals surprising diversity. Alongside religious works and hagiographies, it included encyclopedias, scientific works, historical writings, administrative documents, classical authors, animal tales, poetry, and numerous musical manuscripts. 

Indeed, the abbey was not only a religious community, but also an organization possessing vast estates, an administration, and a rich intellectual culture. 

Copying in the scriptorium was true "monk’s work"—not always pleasant, rather nerve-wracking, and often done in freezing conditions. The monks might visit the warming room (chauffoir), not to warm themselves, but to make their ink liquid again.