On July 9th, 1789. Right after the Tennis court oath.
Source:
http://bastille-day.com/history/Estates-General-1789
The National Assembly was formed by the representatives of the Third Estate of the Estates General. After the French Revolution the National Assembly became known as the National Constituent Assembly.
The Legislative Assembly, as a significant political body, was notably established during the French Revolution in 1791. It succeeded the National Constituent Assembly and operated until 1792, when it was replaced by the National Convention. The assembly was responsible for enacting laws and addressing various issues during a tumultuous period in French history.
National Assembly
National Assembly of Thailand was created in 1932.
National Assembly for Wales was created in 1998.
National Assembly of Bahrain was created in 1973.
National Assembly of Armenia was created in 1938.
National State Assembly ended in 1978.
National State Assembly was created in 1972.
National Assembly Building was created in 1975.
National Assembly of Cambodia was created in 1993.
National Assembly of Bulgaria was created in 1886.