40004542, Marlborough, 598, Zeus, with thunderbolt and spear, in a quadriga riding over two snake-legged giants, one armed with a club; ground beneath the chariot wheels., Walters Art Museum, Baltimore, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), 42.1058, Cameo, Sardonyx

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