The great many mosaic scenes in the atrium and interior are accompanied
by inscriptions that enrich and broaden the spiritual meaning of
the mosaics themselves.
All the scenes feature a literary text in Latin, mostly drawn from
the books of the Old and New Testaments. There are mediaeval
prayers or invocations. The individual figures of the saints
are also accompanied by their names.
Over and above the Latin inscriptions there are a few in Greek. These
are associated with the numerous images of Jesus and the Virgin,
always accompanied by their monograms.