England: Charles I Beheaded
On this day in 1649, Charles I (19 November 1600 – 30 January 1649) was executed by being beheaded in England. His reign had begun on the 27th March 1625.
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England: Ritual Execution of Oliver Cromwell
On this day in 1661, Oliver Cromwell, Lord Protector of the Commonwealth of England, was ritually executed two years after his death and on the same day as the king he deposed.
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France: Execution of Louis XVI
Louis XVI began his reign on the 10th May 1774 as King of France and Navarre, before becoming King of the French on the 1st October 1791. His reign ended on the 21st September 1792 and he was executed (beheaded) by guillotine on this day in 1793 at the Place de la Revolution.
Louis XVI supported the Americans in the War of Independence, prior to the French Revolution which ended the monarchy in France and therefore his reign.