Having run through most of the History of Rome podcast, after an emperor went king Joffrey, after his assassination it was common to destroy works associated with him. Crushing, burning etc but the sewer was a popular place as well, especially for the corpses.

If I remember correctly, Commodus was a particularily despicable emperor who was obsessed with the idea of him being a reincarnation of Hercules. He started wearing garb like in the statue depicted as well as walking around with Hercules’ club.

The reason why he thought he was Hercules was because his handlers gave him disabled people to fight to the death so he could pretend to be a great gladiator.