Columbia subject headings:
Art, Greek--Themes, motives.
Art, Roman--Themes, motives.
Rivers in art.
Harvard subject headings:
Allegories
Art, Classical.
Gods in art.
Personification in art.
Rivers in art.
Symbolism in art.
Princeton subject headings:
Art, Roman.
Emperors--Rome--Portraits.
Portraits.
Roman provincess--History.