Columbia subject headings:
Albigenses--Congresses.
Albigenses--France--Languedoc--Congresses.
Aristocracy (Social class)--France--Languedoc--Congresses.
Aristocracy (Social class)--Religious life--France--Languedoc--Congresses.
Languedoc (France)--Church history--Congresses.
Troubadours--Congresses.
Harvard subject headings:
Albigenses--France--Languedoc--History--Congresses.
Christian heresies--France--Languedoc--History--Middle Ages, 600-1500--Congresses.
Languedoc (France)--Church history--Congresses.
Princeton subject headings: