Lost mosaics and frescoes of Rome of the mediaeval period; a publication of drawings contained in the collection of Cassiano dal Pozzo, now in the Royal Library, Windsor Castle (1915)
Morey, Charles Rufus, 1877-1955 · Princeton, N.J., Princeton university press; [etc., etc.] · leaf 50
e Damiano in the Roman Forum, is easily the most beautiful in Rome. This it owes to the fact that it is the first of the Roman mosaics to show the newly formed Byzantine style in the fulness of its decorative splendor, and to use its deep and quiet color harmony of blue and green and gold. Against… … Fig. 6. Apse and Arch of SS. Cosma e Damiano, present state. 35
Windsor Castle. Royal Library · Church decoration and ornament · Mosaics
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.