Columbia subject headings:
Crusades--Poetry.
Epic poetry, French.
French poetry--To 1500.
Lohengrin (Legendary character)--Legends.
Harvard subject headings:
Crusades--Poetry
Epic poetry, French.
French poetry--To 1500
Lohengrin (Legendary character)--Romances.
Princeton subject headings:
Crusades--Poetry.
Epic poetry, French.
French poetry--To 1500.
Poetry.
Swan-knight (Legendary character)--Legends.