St. Catherine of Alexandria
Manuscript illumination from the Gualenghi d'Este Hours
As an emblem of her erudition, the saint is shown reading a book. In the niche above the book is a statue of the Virgin and Child, who figure in later versions of the Catherine story. At her left is her most common attribute, a spiked wheel. Uncommonly, she does not wear a crown.
The images in the margin may or may not relate to the portrait of the saint. The anchor is conventionally a symbol of faith; the pelican, of Christ. The museum's website suggests that the scrolls of musical note are a further symbol of Catherine's erudition.
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Source: Wikimedia Commons