Final answer:
The phase in which the tempo of executions increased sharply in Paris, reaching 800 or more per month, was known as the Reign of Terror.
Step-by-step explanation:
The tempo of executions increase to 800 or more per month in Paris alone during this new phase called the Reign of Terror. The tempo of executions surged dramatically during the Reign of Terror, a harrowing phase of the French Revolution. This period, spanning from 1793 to 1794, was marked by radical political upheaval and intense violence in France. Under the authority of the Committee of Public Safety led by Maximilien Robespierre, the government aimed to eliminate perceived enemies of the revolution. The executions reached an alarming pace, with Paris witnessing around 800 or more executions monthly. The guillotine became a symbol of terror as it was used relentlessly to execute individuals, including perceived counter-revolutionaries, aristocrats, and anyone suspected of opposing the revolutionary ideals. The Reign of Terror reflected a period of extreme political repression and violence, where fear and paranoia dominated, leading to a tragic loss of lives and a legacy of horror within the history of the French Revolution.