Final answer:
Robespierre was arrested on July 27, 1794, and executed the following day, ending the Reign of Terror and leading to a decline in the frequency of executions.
Step-by-step explanation:
Maximilien Robespierre was arrested on July 27, 1794. The next day, on July 28, Robespierre and 21 of his followers were taken to the guillotine and executed. This event marked the end of the Reign of Terror, and led to a slowdown in executions. After the heads of Robespierre and other Jacobins fell, executions slowed considerably. The fall of Robespierre facilitated the rise of a more conservative government known as the Directory, and set the stage for the eventual rise of Napoleon Bonaparte.