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