Why were illuminated letters included in manuscripts in the middle ages?

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to help people who couldn't read understand what it was about
to show which parts of the manuscript were the most important
just for show

The primary reason illuminated letters were included in manuscripts in the Middle Ages was for decorative purposes. They were used to enhance the beauty of the text and make the manuscript more visually appealing. In addition, they could also serve as a way to highlight important sections of the text or add to the overall aesthetic of the manuscript. While they may have helped some illiterate individuals understand the content of the text, their main purpose was for aesthetic purposes.