Columbia subject headings:
Middle Ages.
Revenge--Europe--History--To 1500.
Revenge--Political aspects--Europe--History--To 1500.
Revenge--Religious aspects--Christianity.
Revenge--Social aspects--Europe--History--To 1500.
Harvard subject headings:
Middle Ages.
Revenge--Europe--History--To 1500.
Revenge--Political aspects--Europe--History--To 1500.
Revenge--Religious aspects--Christianity
Revenge--Social aspects--Europe--History--To 1500.
Princeton subject headings:
Middle Ages.
Revenge--Europe--History--To 1500.
Revenge--Political aspects--Europe--History--To 1500.
Revenge--Religious aspects--Christianity.
Revenge--Social aspects--Europe--History--To 1500.