Ancient Roman Statuary at the Metropolitan Museum of Art, New York: ERCOLE -- Sardonyx cameo fragment with ERCOLE tying up CERBERUS -- Gift of Milton Weil, 1932.

Speranza

Sardonyx cameo fragment with Hercules tying up Cerberus
Period: Early Imperial
Date: 1st century B.C.–1st century A.D.
Culture: Roman
Medium: Sardonyx
Dimensions: H.: 1.6 x 2.6 cm
Classification: Gems
Credit Line: Gift of Milton Weil, 1932
Accession Number:
1932.142.1
This artwork is currently on display in Gallery 166

References
Richter, G.
2006: 2nd Edition.
Catalogue of Roman Engraved Gems. Rome: L'Erma di Bretschneider, no. 637, p. 128, pl. 72.