Columbia subject headings:
Harvard subject headings:
Godfrey, of Bouillon, approximately 1060-1100--Romances.
Lohengrin (Legendary character)--Romances.
Princeton subject headings:
Fiction.
Godfrey, of Bouillon, approximately 1060-1100--Romances.
Romances.
Swan-knight (Legendary character)--Romances.