40000598, Poniatowski, T570, PHRYXUS SLAYING A RAM BEFORE THE ALTAR OF JUPITER, GNAIOS, Gnaios, Prendeville, J.: Explanatory catalogue of the proof-impressions of the antique gems possessed by the late Prince Poniatowski and now in the possession of John Tyrrell, Esq. (1841), Christie's, London, Catalogue des pierres gravées antiques de S.A. le Prince Stanislas Poniatowski ([1830?]-1833), 570, Amethyst