The Blacas Cameo is an unusually large Ancient Roman cameo, 12.8 cm (5.0 in) high, carved from a piece of sardonyx with four alternating layers of white and brown. It shows the profile head of the Roman emperor Augustus and probably dates from shortly after his death in AD 14, perhaps from AD 20-50. It has been in the British Museum since 1867, when the museum acquired the famous collection of antiquities that Louis, Duke of Blacas had inherited from his father, also including the Esquiline Treasure. Normally it is on display in Room 70.