He castrated a boy so he could marry him

Statilia Messalina, who was reportedly descended from a successful Roman general and was far less of a public figure than her two predecessors, was Nero's third wife shortly after he is said to have assassinated Poppaea. The fact that Nero didn't seem to be able to let go of Poppaea after her death is one of the strangest things about him. He once ran into a young man named "Sporus" who reminded him a lot of Poppaea.

At least in the eyes of Nero, who dispatched his soldiers to track down the kid, gave the order to castrate him, and then wed him to become his "wife." The wedding party was just as large as at any of his prior unions, and the ceremony and ceremonies were also exactly the same, so this wasn't just a secret thing. After that, Sporus continued to live with Nero as his wife.

Before Vespasian, the final "temporary emperor," could exploit Sporus in a violent recreation of the Rape of Proserpina at a gladiator exhibition, Sporus found himself in the hands of Nero's successors after his death. Sporus eventually killed himself.