<human>:  With regards to the history of crime, who was the first person to be executed by guillotine?
<bot>: The first person to be executed by guillotine was Marie-Antoinette. She was executed in 1793 at the age of 39. Marie-Antoinette was a queen of France and the wife of King Louis XVI. She was accused of treason and complicity in the French Revolution. She was convicted of treason and sentenced to death by guillotine, along with her husband. She was beheaded on October 16, 1793.