20 Historical Poisons That Shook Up Politics, War, and Royal Families

We remember hemlock less as a plant than as the final drink offered to Socrates. Ancient Athens made the poison a form of public execution, and this death provided philosophy with one of its most memorable scenes: a condemned man so serene that he became immortal in the accounts of his story. 

Claudius, Emperor of Rome, died in A.D. 54, and Roman tradition blamed Agrippina for his death, as she wished to secure the throne for Nero. The details vary, but the political outcome remained the same: a simple meal helped pave the way for one of Rome’s most infamous reigns. 

In Nero’s world, poisoning had almost become common practice at court. The Encyclopædia Britannica mentions the belief that Agrippina poisoned Claudius and Britannicus to ensure Nero’s succession, which gives the impression that the Julio-Claudian court resembled less a dynasty than a dinner party that no one should have attended.

Cleopatra’s death is generally depicted as involving an asp, although both ancient and modern accounts leave room for doubt. What matters from a historical perspective is the outcome: Antony and Cleopatra died, Egypt fell under Roman rule, and the poison became part of the myth of a queen who refused to be put on display. 

Mithridates VI of Pontus feared being poisoned so much that his name has become inextricably linked to the fight against poisoning. The irony is almost too obvious: this king, who fought against Rome, also waged a battle at his own table, turning his paranoia into policy and his antidotes into a royal spectacle. 

Arsenic became the quintessential political poison, as it fit all too naturally into the world of inheritance, marriage, and ambition. In Renaissance Italy, as historians of toxicology point out, poisoning was so closely linked to power struggles that people came to be suspicious of supposedly natural deaths among popes, cardinals, and members of royalty. 

Cantarella lies halfway between chemistry and legend, and it is precisely for this reason that it has endured. It is said that the Borgias used this arsenic-based poison, but its exact composition remains unclear, leaving the family shrouded in rumors that may outlive any verdict. 

Aqua Tofana was a 17th-century Italian poison associated with women trapped in abusive or unwanted marriages. Its history remains unclear, but the legend speaks volumes about its power: when the law left certain people with no way out, the poison became a terrible alternative that was spoken of only in whispers.

Qin Shi Huang longed for immortality, one of the most dangerous desires in history. Later accounts attribute his death to toxic elixirs, and the presence of mercury in his tomb continues to imbue this story with the strange and tragic logic of absolute power attempting to bargain with death.

Curare has become firmly established in the European imagination as an arrow poison derived from the hunting traditions of the indigenous peoples of South America. It also went on to revolutionize medicine, giving it a dual existence: first feared in colonial accounts, then studied in operating rooms, where what was once associated with death has become part of controlled medical care. 

In Ypres, in 1915, gas leaked from a soldier’s quarters and spread across the battlefield. Germany’s first large-scale use of poison gas broke through the Allied lines, and even though this advantage was not fully exploited, the war had crossed a point of no return. 

Mustard gas was first used by Germany in 1917 and quickly became one of the most feared weapons of World War I. It didn’t need to look spectacular to be terrifying; its purpose was to incapacitate enemies, linger in the air, and create the impression that the battlefield remained contaminated long after the bombardments had ended. 

Zyklon B was originally a pesticide, but today its name is inextricably linked to the Holocaust. The Nazis used this hydrogen cyanide-based compound to carry out mass murder, thereby transforming an industrial product into one of the most poignant symbols of the history of bureaucratized evil.

Cyanide became the poison of the dying days of the Third Reich. It is generally believed that Hitler took his own life with a gunshot; some sources claim that he also bit into a cyanide capsule, while Eva Braun poisoned herself with cyanide alongside him in the Berlin bunker. 

Agent Orange was not a poison used in covert operations, but a strategy of war sprayed from the air. Used by the U.S. military during the Vietnam War to clear forests and destroy crops, it left a legacy that has outlived the battlefield and continues to influence collective memory, health, and diplomacy.

Dioxin entered modern political history through Viktor Yushchenko, who fell seriously ill during the 2004 Ukrainian presidential campaign. His disfigured face turned what appeared to be a case of poisoning into an event the public could not look away from, and his very body became a piece of evidence in the campaign.

The most famous political case involving ricin dates back to 1978, when Bulgarian dissident Georgi Markov died in London following an attack in which he was struck by a bullet laced with ricin. The story reads like a spy novel, so spectacular was it, but its objective was blatantly brutal: to silence a critic far from home. 

The poisoning of Alexander Litvinenko in London gave the issue of radiation a personal dimension. The Encyclopædia Britannica describes his death as an intentional poisoning with polonium-210, and the case led to a diplomatic rift as well as a murder investigation. 

The VX affair burst onto the North Korean political scene in 2017 with the assassination of Kim Jong-nam, the North Korean leader’s exiled half-brother. It was not merely a family matter, even though it had all the hallmarks of one; it turned into a murder committed at an airport with global repercussions. 

Novichok has brought back the ghosts of the Cold War to a perfectly ordinary English city. The poisoning of Sergei and Yulia Skripal in Salisbury in 2018 took on an international dimension, demonstrating that poison remains an effective means not only of targeting an individual, but also of sending a message to all those watching the situation unfold.