Columbia subject headings:
Chrétien, de Troyes, active 12th century. Ywain.
Hartmann, von Aue, active 12th century.
Harvard subject headings:
Arthurian romances.
Chrétien, de Troyes, active 12th century. Chevalier au lyon
Yvain (Legendary character)--Romances.
Princeton subject headings:
Ywain (Legendary character)--Romances.