Columbia subject headings:
Harvard subject headings:
Celestine V, Pope, 1215-1296--Congresses.
Church history--13th century--Congresses.
Sicily (Italy)--Boundaries.
Sicily (Italy)--History--1282-1409
Princeton subject headings:
Celestine V, Pope, 1215-1296--Congresses.
Church history--13th century--Congresses.
Sicily (Italy)--Boundaries.
Sicily (Italy)--History--1282-1409.