Columbia subject headings:
Art patronage--Europe--History--Congresses.
Arts and society--Europe--History--Congresses.
Nobility--Europe--History--Congresses.
Harvard subject headings:
Art patronage--Europe--History--Congresses.
Arts and society--Europe--History--Congresses.
Nobility--Europe--History--Congresses.
Princeton subject headings:
Art patronage--Europe--History--Congresses.
Arts and society--Europe--History--Congresses.
Nobility--Europe--History--Congresses.