images.library.wisc.eduimages.library.wisc.edu/Arts/EFacs/Arts/ChazPubs/...Chatzidakis, V. N....
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images.library.wisc.eduimages.library.wisc.edu/Arts/EFacs/Arts/ChazPubs/...Chatzidakis, V. N. Lazarev, and K. Weitzmann. From written sources, we know that even before the ninth century