Columbia subject headings:
Harvard subject headings:
Arthurian romances--History and criticism.
Chrétien, de Troyes, active 12th century. Perceval le Gallois.
Grail--Legends--History and criticism
Knights and knighthood in literature.
Paradox in literature.
Quests (Expeditions) in literature.
Wales--In literature.
Princeton subject headings:
Chrétien, de Troyes, active 12th century. Perceval le Gallois.