20 most evil world leaders – number one killed 70m people

From bloodthirsty medieval tyrants to 20th-century despots, these totalitarians and conquerors left trails of devastation across the globe.History is stained with the blood of tyrants, warlords and ruthless despots who stopped at nothing to consolidate power. From medieval conquerors who laid waste to entire civilisations to 20th-century totalitarians whose radical policies triggered catastrophic starvation, the true scale of their terror is staggering.