ganymedesrocks:

Where the Ares Borghese posted earlier is a Roman marble statue of the imperial era (1st or 2nd century AD), this representation of Ares is perhaps even more rare an example of the ancient Greek world. It is thought to be part or derived from one by Alcamenes. Is it the head from the statue of Ares that according to Pausanias was erected on the Athenian agora? Such as the Ares Borghese, this marble head is identifiable as Ares by its ornate helmet. Its period is likely to range somewhere from the 5th to the 2nd century BC.