An illuminated manuscript is a manuscript in which the text is supplemented with such decoration as initials, borders (marginalia) and miniature illustrations. In the strictest definition, the term refers only to manuscripts decorated with gold or silver; but in both common usage and modern scholarship, the term refers to any decorated or illustrated manuscript from Western traditions. Comparable Far Eastern and Mesoamerican works are described as painted. Islamic manuscripts may be referred to as illuminated, illustrated or painted, though using essentially the same techniques as Western works. This article covers the technical, social and economic history of the subject; for an art-historical account, see miniature.
The earliest surviving substantive illuminated manuscripts are from the period 400 to 600, produced in the Kingdom of the Ostrogoths and the Eastern Roman Empire. The significance of these works lies not only in their inherent artistic and historical value, but also in the maintenance of a link of literacy offered by non-illuminated texts. Had it not been for the monastic scribes of Late Antiquity, most literature of Greece and Rome would have perished in Europe. As it was, the patterns of textual survivals were shaped by their usefulness to the severely constricted literate group of Christians. Illumination of manuscripts, as a way of aggrandizing ancient documents, aided their preservation and informative value in an era when new ruling classes were no longer literate, at least in the language used in the manuscripts.
The majority of surviving manuscripts are from the Middle Ages, although many survive from the Renaissance, along with a very limited number from Late Antiquity. The majority of these manuscripts are of a religious nature. However, especially from the 13th century onward, an increasing number of secular texts were illuminated. Most illuminated manuscripts were created as codices, which had superseded scrolls. A very few illuminated manuscript fragments survive on papyrus, which does not last nearly as long as vellum or parchment. Most medieval manuscripts, illuminated or not, were written on parchment (most commonly of calf, sheep, or goat skin), but most manuscripts important enough to illuminate were written on the best quality of parchment, called vellum.