Short answers, pulled from the story.
Mobs of Parisians killed over half of the prisoners including nobles and clergymen during the first week of September 1792. This violence became known as the September Massacres after common criminals like prostitutes and petty thieves also died in their cells.
The Republic was declared one and indivisible on the 25th of September 1792 by deputies of the Convention who gathered for the first time on the 21st of September 1792. They unanimously decided to abolish the constitutional monarchy in France and date all acts from the year I of the Republic.
The Convention created the Committee of Public Safety on the 6th of April 1793 to deal with radical movements and food shortages. This body instated a policy of terror where perceived enemies of the republic began to be executed by guillotine at an ever-increasing rate.
The Directory lasted only four years before being overthrown in 1799 after internal instability caused by hyperinflation of paper monies known as Assignats plagued the system. The regime collapsed following French military disasters in 1798 and 1799 which contributed to its downfall.
Napoleon was proclaimed Emperor of the French on the 18th of May 1804 ending the First French Republic. This declaration ushered in the First French Empire while the Conservative Senate comprised sixty irremovable members appointed by Bonaparte.