40005082, Marlborough, 458, Portrait (profile right): Caligula. The head of Caligula with a mourning beard., Blenheim Palace, Woodstock, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 458, Sardonyx

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