Columbia subject headings:
Harvard subject headings:
Civilization, Medieval
Crises in literature.
Crises--History--To 1500.
Disasters in literature.
Disasters--History--To 1500.
Literature, Medieval--History and criticism
Middle Ages
War in literature.
War--History--To 1500.
Princeton subject headings:
Civilization, Medieval.
Crises--History--To 1500.
Disasters--History--To 1500.
Natural disasters--History--To 1500.
War--History--To 1500.