Columbia subject headings:
Art, Early Christian--Italy--Rome--Influence.
Basilica di San Pietro in Vaticano.
Church decoration and ornament--Italy.
Mosaics, Medieval--Italy.
Mural painting and decoration, Medieval--Italy.
Harvard subject headings:
Princeton subject headings:
Architecture, Medieval--Vatican City.
Basilica di San Pietro in Vaticano.
Vatican City--Buildings, structures, etc.