40000311, Poniatowski, T280, PERSEUS HOLDING THE HEAD OF MEDUSA, FROM WHICH DROPS OF BLOOD ARE FALLING [PEGASUS SPRINGING FROM THE BLOOD] (THE ORIGINS OF PEGASUS), KROMOU, Kromos, Private Collection, The Wellington Gems (1977) [London, Market, S.J. Phillips], Catalogue des pierres gravées antiques de S.A. le Prince Stanislas Poniatowski ([1830?]-1833), 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, 416.5, Sardonyx