Columbia subject headings:
Albigenses--France.
Christian heresies--History--Middle Ages, 600-1500.
Gnosticism.
Harvard subject headings:
Albigenses--France.
Christian heresies--History--Middle Ages, 600-1500
Gnosticism
Grail--Legends--Sources.
Princeton subject headings:
Albigenses--France.
Christian heresies--History--Middle Ages, 600-1500.
Gnosticism.