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San Vitale
http://www.sacred-destinations.com/italy/ravenna-san-vitale
https://www.khanacademy.org/humanities/medieval-world/byzantine1/venice-ravenna/a/justinian-mosaic-san-vitale
https://www.oneonta.edu/faculty/farberas/arth/arth212/san_vitale.html
http://www.metmuseum.org/exhibitions/listings/2012/byzantium-and-islam/blog/topical-essays/posts/san-vitale
