Columbia subject headings:
Lancelot (Legendary character)--Congresses.
Harvard subject headings:
Arthurian romances--History and criticism--Congresses.
Civilization, Medieval, in literature--Congresses.
Knights and knighthood in literature--Congresses.
Lancelot (Legendary character)--Congresses.
Lancelot (Legendary character)--Romances--History and criticism--Congresses.
Princeton subject headings:
Arthurian romances--History and criticism--Congresses.
Chrétien, de Troyes, active 12th century. Chevalier de la charrette--Congresses.
Lancelot (Legendary character)--Criticism, interpretation, etc.--Congresses.