The Book of Kells
Chi Rho Iota, Scotland. Late 8th or early 9th century. Oxgall inks and pigments on vellum, 12 3/4 x 9 1/2″ (32.5 x 24 cm). The Board of Trinity College, Dublin.
Recommended Reading
BBC Culture Article
The Book of Kells: Medieval Europe’s Greatest Treasure?
Smarthistory Video