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Qin Shi Huang (259–210 BCE) -

Qin Shi Huang, the founder of the Qin dynasty and first emperor of China, would eliminate scholars who opposed his views. He is famous for building a mausoleum protected by life-sized terra-cotta soldiers. To ensure the secrecy of the burial site, the workers were murdered after its construction.

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Caligula (12–41) -

Gaius Caesar Augustus Germanicus, also known as Caligula, initially ruled as a noble and fair emperor. However, following a near-death experience from an unknown illness, he transformed into a notorious tyrant known for his cruelty, sadism, extravagance, and sexual deviancy.

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Attila the Hun (c. 406-453) -

Attila, the ruler of the Hunnic Empire, which included Central and Eastern Europe, was a formidable adversary of the Roman Empire. Known for his strong presence, he was renowned for his expertise on the battlefield and the fear he instilled.

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Wu Zetian (624-705) -

Wu Zetian, the sole female ruler in Chinese history, gained notoriety for her uncompromising approach. She was relentless in her pursuit of power, showing no mercy towards her adversaries, whether through dismissal, exile, or execution.

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Genghis Khan (c. 1158-1227) -

Genghis Khan, the founder and first Great Khan of the Mongol Empire, is known as one of history's greatest conquerors. However, his reputation is tarnished by his tendency to massacre civilians on a large scale. He showed no reluctance to exploit adversaries as human shields during warfare, and his ruthless leadership led to the death of millions.

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Timur (1336–1405) -

Timur, also known as Tamerlane, was the founder of the Timurid Empire. He gained notoriety for his brutal warfare tactics, which included the gruesome practice of embedding body parts of his enemies in the walls of towers and minarets.

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Tomás de Torquemada (1420–1498) -

Torquemada, the first Grand Inquisitor during the Spanish Inquisition, oversaw the execution of around 20,000 individuals through burning. His name continues to be linked with cruelty, religious narrow-mindedness, and zealotry.

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Vlad III (1428/31–1476/77) -

Known as Vlad the Impaler, Vlad III was the ruler of Wallachia (now Romania). He gained notoriety for his gruesome acts of stabbing and impaling his enemies on spikes. This infamous reputation served as the inspiration for the legendary vampire Count Dracula.

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Queen Mary I (1516–1558) -

Mary I assumed the throne of England in 1553. She launched a determined campaign to overturn the English Reformation and restore Catholicism, which led to the execution of numerous Protestants and religious dissidents through burning at the stake. This earned her the notorious nickname "Bloody Mary."

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Ivan the Terrible (1530–1584) -

Ivan IV, the inaugural Czar of Russia, exhibited a tendency toward paranoia, fits of anger, and sporadic episodes of mental instability. Historians maintain that he was responsible for his son's death and for brutally assaulting his pregnant daughter-in-law while in a fit of rage. It was throughout his prolonged and horrifying rule, marked by the brutal suppression of Russian aristocracy and subsequent aggression against Novgorod, that Ivan earned the infamous nickname, "Ivan the Terrible."

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Tokugawa Ieyasu (1543–1616) -

Tokugawa Ieyasu is widely recognized in history as a prominent figure in the unification of Japan. He established and served as the first shogun of the Tokugawa shogunate, a significant period in Japan's governance. However, his ascent to power was accompanied by a substantial loss of lives. His opponents, including disobedient relatives, swiftly faced execution.

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Elizabeth Báthory (1560–1614) -

Countess Elizabeth Báthory de Ecsed, a Hungarian noblewoman, holds the Guinness World Record for being the most prolific female murderer in history. She allegedly murdered hundreds of young girls and women from 1590 to 1610, with an estimated death toll of 650 victims.

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Oliver Cromwell (1599–1658) -

Oliver Cromwell, an English general and statesman, successfully led the Roundheads to triumph over the Royalists in the English Civil War. Additionally, he played a role in signing the death warrant of King Charles I in 1649. Although he governed the British Isles as Lord Protector, he was widely considered a regicidal military dictator. Cromwell's actions towards Catholics, especially in Scotland and Ireland, approached near-genocidal levels.

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Max Robespierre (1758–1794) -

Maximilien Robespierre, a French lawyer and statesman, played a vital role during the French Revolution and the ensuing "Reign of Terror," resulting in numerous executions by guillotine.

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Leopold II (1835–1909) -

King Leopold II of Belgium established the Congo Free State, which he claimed as his personal "private colony." Through the exploitation of the Congolese people in forced labor for ivory and rubber, Leopold amassed great wealth. His rule in the Congo involved horrific acts of violence, such as torture and murder, and resulted in the deaths of many from starvation and neglect.

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Ismail Enver Pasha (1881–1922) -

Enver Pasha, who assumed the position of Minister of War of the Ottoman Empire in 1914, was partly accountable for the Armenian Genocide. This atrocity involved the organized massacre and forced removal of ethnic Armenians in Turkey, culminating in the tragic loss of approximately 1.5 million lives.

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Vladimir Lenin (1870–1924) -

Despite being regarded as a prominent and influential individual of the 20th century, Lenin established and headed an autocratic government that was accountable for political suppression and mass killings.

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Joseph Stalin (1878–1953) -

Stalin took over the Soviet Union after Lenin's passing in 1924. He oversaw the famine of 1932–33, initiated the Great Purge that resulted in over a million people being imprisoned and at least 700,000 executed from 1934 to 1939. Additionally, he ordered the imprisonment of numerous individuals in the Gulags.

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Khorloogiin Choibalsan (1895-1952) -

Khorloogiin Choibalsan, the Mongolian leader, greatly admired Joseph Stalin and implemented purges in the 1930s that mirrored the Soviet style. These purges tragically caused the deaths of approximately 30,000 to 35,000 Mongolians, including Buddhist clergy, intellectuals, political dissidents, and individuals belonging to ethnic minorities.

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Adolf Hitler (1889–1945) -

Adolf Hitler, the leader of the Nazi Party, caused the deaths of millions. He strongly was a raging anti-Semite and sought Aryan supremacy, leading to the genocide of approximately six million Jews and numerous others during the Holocaust.

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Benito Mussolini (1883–1945) -

Mussolini established the Fascist Party in Italy, serving as a model for other dictators like Adolf Hitler and Francisco Franco in Spain. Later, in 1936, he allied with Hitler and prompted Italy's participation in the devastating Second World War.

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Francisco Franco (1892–1975) -

Francisco Franco, a Spanish general, commanded the Nationalist forces that successfully toppled the Second Spanish Republic in the Spanish Civil War, causing a minimum of 500,000 casualties. Following this victory, he governed Spain as a dictator, characterized by a combination of harsh repression and economic growth.

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Hideki Tojo (1884-1948) -

Hideki Tojo was the Prime Minister of Japan throughout the majority of World War II. He not only approved of preemptive strikes on the United States and its European allies but also oversaw numerous war crimes, such as the massacre and starvation of innocent civilians and prisoners of war.

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Mao Zedong (1893–1976) -

In 1966, Mao Zedong, a Chinese communist revolutionary and the founder of the People's Republic of China, launched the Cultural Revolution. This initiative aimed to eliminate "counter-revolutionary" elements from society. The Revolution resulted in the persecution of tens of millions of individuals, and the number of deaths is estimated to range from hundreds of thousands to millions.

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Nicolae Ceaușescu (1918-1989) -

Nicolae Ceaușescu, a Romanian communist politician, had absolute control over a totalitarian regime that enforced extensive surveillance and committed severe human rights abuses within the country. From the 1970s onward, this regime was regarded as the most oppressive in the Eastern Bloc.

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Pol Pot (1925–1998) -

Pol Pot was a political leader who ruled Cambodia from 1975 to 1979 through the Khmer Rouge government. Within this period, approximately 1.5 to 2 million Cambodians tragically lost their lives due to starvation, diseases, overwork, or execution in the infamous "killing fields." The Pol Pot regime is widely seen by historians as one of the most brutal regimes in contemporary history.

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Idi Amin (1925–2003) -

Idi Amin, a Ugandan military officer, held the presidency of Uganda from 1971 to 1979. During his leadership, there was a targeted mistreatment of specific ethnic groups and political dissidents, along with numerous human rights violations and unlawful killings. According to international observers and human rights organizations, between 100,000 and 500,000 individuals lost their lives under Amin's rule. These appalling actions establish Amin as one of the most ruthless dictators in the annals of world history.

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Augusto Pinochet (1915–2006) -

Following his ascent to power, Augusto Pinochet, a Chilean Army General, targeted leftists, socialists, and political critics. As a result, approximately 3,200 individuals were executed, while numerous others were subjected to torture or went missing.

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Mobutu Sese Seko (1930-1997) -

Mobutu Sese Seko's presidency in Zaire (now the Democratic Republic of the Congo) was marked by widespread human rights violations, economic exploitation, and corruption. During his rule, the nation faced rampant inflation, significant debt, and extensive currency devaluations. His personal wealth is believed to have reached millions.

Sources: (Guinness World Records) (History Collection) (Britannica)

See also: Who are the most infamous mobsters and gangsters?

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