Columbia subject headings:
Art and state--Europe--History--Congresses.
Europe--Kings and rulers--Congresses.
Royal artists--Congresses.
Harvard subject headings:
Art, European--History--Congresses.
Art, Modern--Congresses.
Royal artists--Europe--History--Congresses.
Princeton subject headings:
Art and state--Europe--History--Congresses.
Europe--Kings and rulers--History--Congresses.
Royal artists--Congresses.