When was the National Convention established in France?
National Convention
from 20 September 1792 to 26 October 1795
The National Convention (French: Convention nationale) was the first government of the French Revolution, following the two-year National Constituent Assembly and the one-year Legislative Assembly.  Created after the great insurrection of 10 August 1792, it was the first French government organized as a republic, abandoning the monarchy altogether.  The Convention sat as a single-chamber assembly from 20 September 1792 to 26 October 1795 (4 Brumaire IV under the Convention's adopted calendar).