Carolingian manuscript illumination refers to the art of decorating manuscripts during the Carolingian Renaissance, which took place in the late 8th to early 9th centuries under the rule of Charlemagne and his successors. This form of art combined classical styles with Christian themes, utilizing vibrant colors, gold leaf, and intricate designs to enhance the texts of religious and scholarly works. It played a crucial role in preserving knowledge and fostering cultural revival during this period.