"The Death of Emperor Commodus", a 19th-century painting by Fernand Pelez. #Commodus
To celebrate the Roman New Year in AD 192, Commodus decided to make an appearance before the Roman people from the gladiator's barracks, escorted by the rest of the gladiators. After telling his plan to his mistress Marcia the night before, she begged him not to behave so carelessly and bring disgrace to the Roman Empire. Commodus, upset by Marcia's reaction, then told his plan to Aemilius Laetus, the Praetorian Prefect, and Eclectus, his servant.
After they, too, tried to dissuade him, he became furious and put their three names on a proscribed list of people to be executed the next morning. While Commodus was taking a bath, his favorite servant Philcommodus found the tablet on which the list was written and ran into Marcia. Marcia took it from him, and in horror saw her name at the top of the list.
She then cried out, "Well done, indeed, Commodus. This is fine return for the kindness and affection I have lavished on you and for the drunken insults which I have endured from you all these years". She then gathered Laetus & Eclectus, and the three of them decided they had to kill Commodus in order to save their own lives.
Marcia then gave the emperor his first drink after his bath, which had already been mixed with poison. After drinking the wine, he became so ill that his vomiting would not cease. The three conspirators were afraid he would expel all the poison, so they ordered an athlete to strangle Commodus for a large reward.