Art historians classify illuminated manuscripts into their historic periods and types, including (but not limited to) Late Antique, Insular, Carolingian manuscripts, Ottonian manuscripts, Romanesque manuscripts, Gothic manuscripts, and Renaissance manuscripts. There are a few examples from later periods. The type of book most often heavily and richly illuminated, sometimes known as a "display book", varied between periods. In the first millennium, these were most likely to be Gospel Books, such as the Lindisfarne Gospels and the Book of Kells. The Romanesque period saw the creation of many large illuminated complete Bibles – one in Sweden requires three librarians to lift it. Many Psalters were also heavily illuminated in both this and the Gothic period. Single cards or posters of vellum, leather or paper were in wider circulation with short stories or legends on them about the lives of saints, chivalry knights or other mythological figures, even criminal, social or miraculous occurrences; popular events much freely used by story tellers and itinerant actors to support their plays. Finally, the Book of Hours, very commonly the personal devotional book of a wealthy layperson, was often richly illuminated in the Gothic period. Many were illuminated with miniatures, decorated initials and floral borders. Paper was rare and most Books of Hours were composed of sheets of parchment made from skins of animals, usually sheep or goats. Other books, both liturgical and not, continued to be illuminated at all periods.