Roman Emperors Poisoned Themselves Intentionally

In the treacherous world of Roman imperial politics, where a rival or relative might slip poison into your wine, paranoia was a key survival tool. To counter this constant threat, some emperors adopted a dangerous practice of self-immunization pioneered by one of Rome's greatest enemies: King Mithridates VI of Pontus. Obsessed with toxicology, Mithridates reportedly ingested a tiny, daily cocktail of known poisons to build up a tolerance. This legendary antidote, known as Mithridatium, became a sought-after defense for rulers who feared a sudden, quiet death.

The concept, now called mithridatism, is not entirely fictional. For certain organic toxins, repeated, non-lethal exposure can stimulate the liver to produce more of the specific enzymes needed to break them down, effectively increasing one's tolerance. However, the practice was a deadly gamble, as it offers no protection against different poisons or higher doses, and it is completely ineffective against cumulative toxins like arsenic or heavy metals, which would simply build to lethal concentrations in the body. In a final, dark irony, Mithridates's own success was his undoing; when defeated, he tried to commit suicide by poison, but his immunity was so effective he had to command a bodyguard to kill him with a sword.