Columbia subject headings:
Harvard subject headings:
Civilization, Medieval, in literature
Knights and knighthood in literature
Perceval (Legendary character)--Romances--History and criticism.
Wolfram, von Eschenbach, active 12th century. Parzival. Buch 4.
Princeton subject headings:
Wolfram, von Eschenbach, active 12th century. Parzival.