It’s a splendid copy of a classical Greek bronze work dating from the Vth century bc, same period as the Parthenon in Athens.
There are similarities in style with the work of Phidias, that we’re still dreaming about…
The head is a plaster cast of another similar statue, now in the Louvre, found in Velletri – a village on the roman hills south of Rome.
The statue was made with marble from Thassus, in Greece.
Centrale Montemartini Museum