Columbia subject headings:
Holy Roman Empire--Foreign relations--Italy--Pisa.
Holy Roman Empire--History--Charles IV, 1347-1378.
Pisa (Italy)--Foreign relations--Holy Roman Empire.
Pisa (Italy)--History.
Harvard subject headings:
Charles IV, Holy Roman Emperor, 1316-1378
Holy Roman Empire--Foreign relations--Italy--Pisa.
Holy Roman Empire--History--Charles IV, 1347-1378.
Italy--History--1268-1492.
Pisa (Italy)--Foreign relations--Holy Roman Empire.
Pisa (Italy)--History.
Princeton subject headings:
Holy Roman Empire--Foreign relations--Italy--Pisa.
Holy Roman Empire--History--Charles IV, 1347-1378.
Pisa (Italy)--Foreign relations--Holy Roman Empire.
Pisa (Italy)--History.