 Complete the following phrase:  The sculpture was either carved by an unknown Hellenistic sculptor of the Pergamene school, in the late third or early second century BC or is a Roman copy of high quality, though its present form was given it by a series of restorers in Rome, ending with Vincenzo Pacetti. The statue was found in the 1620s in the moat below the Castel SantAngelo, Rome, which in Antiquity had been Hadrians Mausoleum. Work on the fortification was undertaken by the Barberini Pope Urban VIII in 1624. The sculpture made its first documented appearance in a receipt for its restoration, 6 June 1628, when it already belonged to the Popes nephew, Cardinal Francesco Barberini. When discovered, the statue was heavily damaged; the right leg, parts of both hands, and parts of the head were missing. The historian Procopius recorded that during the 