Columbia subject headings:
Chrétien, de Troyes, active 12th century.
Grail.
Troyes (France)--History.
Harvard subject headings:
ChreÌtien, de Troyes, active 12th century--Criticism and interpretation.
Chrétien, de Troyes, active 12th century.
Grail--Legends--History and criticism
Troyes (France)--History.
Princeton subject headings:
Chrétien, de Troyes, active 12th century.
Troyes (France)--History.