Scriptorium, literally "a place for writing", is commonly used to refer to a room in medieval European monasteries devoted to the writing, copying and illuminating of manuscripts by monastic scribes. Written accounts, surviving buildings, and archaeological excavations all show, however, that contrary to popular belief such rooms rarely existed: most monastic writing was done in cubicle-like recesses in the cloister, or in the monks' own cells (Schwakhofer, Melinda. "Scriptorium." Inspiraculum. 30 July 2012.). References in modern scholarly writings to 'scriptoria' more usually refer to the collective written output of a monastery, rather than to a physical room.
A scriptorium was a necessary adjunct to a library; wherever there was a library it can ordinarily be assumed that there was a scriptorium. Scriptoria in the conventional sense of a room set aside for the purpose probably only existed for limited periods of time, when an institution or individual wanted a large number of texts copied to stock a library; once the library was stocked, there was no further need for a designated room. By the start of the 13th century secular copy-shops developed; professional scribes may have had special rooms set aside for writing, but in most cases they probably simply had a writing-desk next to a window in their own house. By the time movable type printing presses were invented in the 15th century, the concept of a scriptorium was obsolete.
At this church whose patron was Galla Placidia (died 450), paired rectangular chambers flanking the apse, accessible only from each aisle, have been interpreted as paired (Latin and Greek) libraries and perhaps scriptoria. Their copious illumination, niches .5 meter deep, provisions for hypocausts beneath the floors to keep the spaces dry, have prototypes in the architecture of Roman libraries.
When monastic libraries and scriptoria arose in the early 6th century (the first European monastic writing dates from 517), they defined European literary culture and selectively preserved the literary history of the West. Monks copied Jerome's Latin Vulgate Bible and the commentaries and letters of early Church Fathers for missionary purposes as well as for use within the monastery. The products of the scriptorium provided a valuable medium of exchange. Within the scriptorium, there was typically a division of labor between the monks who readied the parchment for copying by smoothing and chalking the surface, those who ruled the parchment and copied the text, and those who illuminated the text. Sometimes a single monk would engage in all of these stages to prepare a manuscript. By the start of the 13th century, monastic manuscript production declined because secular copyshops had developed to write for the laity. These were closely followed by urban bookshops circa 1250 that before the introduction of printing in the last quarter of the fifteenth century had already virtually replaced the monastery as a source for books.