Answer:
hand-written books with painted decoration that generally includes precious metals such as gold or silver.
Step-by-step explanation:
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The Book of Kells, dating from 800 CE, is an ancient, illuminated manuscript and it served precisely this educational and religious function. The codex narrated through images and text the four gospels of the Christian New Testament, with prefaces and descriptions.
Here's an example of an illuminated manuscript in art.