Columbia subject headings:
Mosaics, Ancient.
Mosaics, Medieval.
Harvard subject headings:
Mosaics, Byzantine--Italy--Ravenna--Themes, motives.
Mosaics, Medieval--Italy--Otranto--Themes, motives.
Mosaics, Roman--Italy--Aquileia--Themes, motives.
Princeton subject headings:
Mosaics, Ancient.
Mosaics, Medieval.