Louis XVI of France. Louis XVI (August 23, 1754 - January 21, 1793) was King of France and Navarre from 1774 to 1791 and as King of the French from 1791 to 1792. Suspended and arrested during the Insurrection of 10 August 1792, he was tried by the National Convention, found guilty of treason, and executed by guillotine on 21 January 1793.