Columbia subject headings:
Grail--Legends.
Perceval (Legendary character)--Romances.
Harvard subject headings:
Arthurian romances.
Grail--Legends
Grail--Romances.
Perceval (Legendary character)--Romances.
Princeton subject headings:
Arthurian romances.
Grail--Legends.
Legends.
Perceval (Legendary character)--Romances.
Romances.