More than 350 decorative designs in this impressive collection, including 256 letters, display the glories of extant medieval manuscripts. Rare letters and borders that once enhanced medieval bibles and other rare manuscripts are ornamented with exquisite florals, curvilinear motifs interwoven with religious figures, and other exquisite embellishments. Original selection of plates from The Art of Illuminating As Practised in Europe from the Earliest Times, originally published by Day & Son, London, 1860.
Here's a sample of other books in this Dover category
Illuminated Initials in Full Color: 548 Designs by Carol Belanger Grafton Extraordinarily beautiful and decorative letters of the alphabet — imaginatively ornamented with royal and saintly figures, mythical creatures, knights in battle, flora and fauna, more.
1001 Illuminated Initial Letters: 27 Full-Color Plates by Owen Jones Magnificently embellished letters of the alphabet — approximately 40 to a page plus one page of roman and arabic numbers — primarily taken from Jones's illustrated The Psalms of David.
Christian Art and Imagery by Alan Weller From the greatest works of Eastern and Western art comes this breathtaking collection. Its 200 color and 13 black-and-white illustrations include paintings by Raphael and Van Eyck, plus mosaic and stained glass imagery.
The Craftsman’s Handbook by Cennino Cennini Fifteenth-century handbook, written by a working artist of the day, reveals techniques of the masters in drawing, oil painting, frescoes, panel painting, gilding, casting, more. Direct link to artists of Middle Ages.