French Constitution of 1791
The short-lived French Constitution of 1791 was the first written constitution in France, created after the collapse of the absolute monarchy of the Ancien Régime. One of the basic precepts of the revolution was adopting constitutionality and establishing popular sovereignty.
French Revolution
Chaos persisted until the Convention, elected by universal male suffrage and charged with writing a new constitution, met on 20 September 1792 and became the new "de facto" government of France. The next day it abolished the monarchy and declared a republic. The following day – 22 September 1792, the first morning of the new Republic – was later retroactively adopted as the beginning of Year One of the French Republican Calendar.