Columbia subject headings:
Harvard subject headings:
Aragon (Spain)--History--Congresses.
Aragon (Spain)--Relations--Italy--Congresses.
Italy--History--1268-1492--Congresses.
Italy--Relations--Spain--Aragon--Congresses.
Italy--Relations--Spain--Congresses.
Spain--History--711-1516--Congresses.
Spain--Relations--Italy--Congresses.
Princeton subject headings:
Aragon (Spain)--History--Sancho Ramírez, 1063-1094.
Aragon (Spain)--Relations--Italy.
Italy--History--1268-1492.
Italy--Relations--Aragon.
Italy--Relations--Spain.
Spain--History--711-1516.
Spain--Relations--Italy.