This is Ares, the God of War, as he stands in a gallery in the Louvre. The Roman sculpture is about 2,000 years ago, which is a copy of an older Greek bronze statue lost to antiquity.
A little research reveals that it is called Ares Borghese because the Borghese family of Rome collected this sculpture and owned it until the Louvre bought it in 1807.
I am no expert in Roman sculpture. The sculpture simply amused me in a very childish way.