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When and where was Charles I executed?

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Painting of the Battle of Naseby shows cavalry and infantry clashing, with soldiers on horseback leading a charge and fallen fighters on the ground amid the chaos of battle. — English Civil Wars Battle of Naseby, by an unknown artist. The victory of the Parliamentarian New Model Army, under Sir Thomas Fairfax and Oliver Cromwell, over the Royalist army, commanded by Prince Rupert, at the Battle of Naseby (June 14, 1645) marked the decisive turning point in the English Civil War.

Charles I was executed on the morning of Tuesday, January 30, 1649. The execution took place on a scaffold erected outside the banqueting hall of Whitehall in London.1