Columbia subject headings:
Grail--Legends--History and criticism.
Harvard subject headings:
Arthurian romances--History and criticism.
Chrétien, de Troyes, active 12th century--Criticism and interpretation.
Cycles (Literature)
French literature--To 1500--History and criticism
Grail--Legends--History and criticism
Guenevere, Queen (Legendary character)--Romances--History and criticism.
Lancelot (Legendary character)--Romances--History and criticism.
Princeton subject headings:
Grail--Legends--History and criticism.