Columbia subject headings:
Harvard subject headings:
Caetani, Pietro, approximately 1245-1308--Sources.
Castello di Ninfa (Italy)--Sources.
Castles--Italy--Ninfa (Extinct city)--Sources.
Ninfa (Extinct city)--Sources.
Princeton subject headings:
Caetani, Pietro, approximately 1245-1308--Sources.
Castello di Ninfa (Italy)--Sources.
Castles--Italy--Ninfa (Extinct city)--Sources.
Ninfa (Extinct city)--Sources.