Columbia subject headings:
Architecture, Medieval--Italy--Rome--History.
Church architecture--Italy--Rome--History.
Liber Pontificalis.
Popes--Art patronage--History.
Rome (Italy)--Buildings, structures, etc.--History.
Harvard subject headings:
Architecture, Medieval--Italy--Rome.
Church architecture--Italy--Rome.
Liber Pontificalis.
Popes--Art patronage
Rome (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Medieval--Italy--Rome--History.
Church architecture--Italy--Rome--History.
Liber Pontificalis.
Popes--Art patronage--History.
Rome (Italy)--Buildings, structures, etc.--History.