Marble copies of the Apollino and the Venus de Medici became very popular with English collectors in the late 18th century. They were very often paired, as in miniature, on: The Chimneypiece of the painted room, Spencer House, London, illustrated, The Greek Revival, J. Mordaunt Crook, London 1972, pl.58; The Gallery of Thomas Hope's House, Deepdene, Surrey, Thomas Hope and the Neo-classical Idea, David Watkin, London 1968, plate 65.
For further reference see F. Haskell and N. Penny, Taste and the Antique, Yale University Press, London 1981, figure 76.