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Content: The approval was given by their leader Robespierre. Was King Louis XVI killed? Yes he was beheaded by the guillotine. When was Louis XVI killed? He was executed on January 21st 1793. Who killed Louis XVI? Robespierre killed Louis XVI and he died by the guillotine Jean-
Paul Marat helped too. Charles Henri Sanson however was the actual
Royal Executioner. What year was King Louis XVI killed? On 21 January 1793.