Columbia subject headings:
Christianity and literature.
Europe--Church history--600-1500.
Grail.
Harvard subject headings:
Arthurian romances--History and criticism.
Christianity and literature.
Christianity--Europe--Middle Ages, 600-1500.
Church history--Middle Ages, 600-1500
Grail
Princeton subject headings:
Christianity and literature.
Christianity--Europe--Middle Ages, 600-1500.
Grail.