Columbia subject headings:
Harvard subject headings:
Arthurian romances--History and criticism.
Civilization, Medieval, in literature.
Hartmann, von Aue, active 12th century. Iwein.
Knights and knighthood in literature.
Romances, German--History and criticism.
Yvain (Legendary character)--Romances--History and criticism.
Princeton subject headings:
Epic poetry, German--History and criticism.
Hartmann, von Aue, active 12th century. Iwein.