Columbia subject headings:
Cardinals--Italy--Correspondence.
Church history--Middle Ages, 600-1500.
Fieschi, Luca, approximately 1273-1336.
Harvard subject headings:
Church history--Middle Ages, 600-1500--Sources.
Fieschi, Luca, active 1300.
Italy--Church history--476-1400--Sources.
Princeton subject headings:
Cardinals--Italy--Correspondence.
Church history--Middle Ages, 600-1500.
Fieschi, Luca, approximately 1273-1336.