Final answer:
Louis XVI was the French leader who was famously beheaded during the revolution in the late 1700s.
Step-by-step explanation:
During the French Revolution in the late 1700s, the French leader who was famously beheaded was Louis XVI. He and his wife, Marie Antoinette, were executed in 1793 in the Place de la Concorde along with thousands of other aristocrats who were believed to be loyal to the monarchy. The execution of Louis XVI marked a significant moment in the revolution's radicalization and the rise of the Jacobins.