19th Century depiction of the crucifixion.
The Crucifixion of Quintillus in 271 was the most public and violent account of regicide during the crisis of the 3rd century. Following the Battle of the Caelian Hill, Rome erupted into a riot over coinage reforms. This tipping point led to a precipitious downfall of order in the capital city, and the riot became a full-blown revolt. Quintillus, still shamed by the Battle of the Caelian Hill, insisted on leading Rome's forces against the revolt. Instead, disloyal elements in the army and a senatorial scheme led to near anarchy. Quintillus was wounded during the fighting and dragged into the Roman Coliseum where he was publically crucified before his own population. Rome had lost Augusti to humiliating means, but for the Emperor's own citizenry kill him in a frenzy was a signal that the unified Imperial regime over the Mediterranean was in the throes of death.