The last monarch of France executed during the French Revolution was King Louis XVI. He was formally tried by the National Convention, known for its radical stance against monarchy. In January 1793, he was found guilty of treason and subsequently guillotined, an act that symbolized the overthrow of the monarchy and the establishment of a republic. His execution was a pivotal moment in the revolution, leading to a period of social and political turmoil characterized by the Reign of Terror. Louis XVI's death marked a significant shift in France's governance and the broader European landscape.