Constitution of the Year XII
The Constitution of the Year XII was a national constitution of France adopted during the Year XII of the French Revolutionary Calendar (1804 in the Gregorian calendar).
It amended the earlier Constitution of the Year VIII and Constitution of the Year X, establishing the First French Empire with Napoleon Bonaparte — previously First Consul for Life, with wide-ranging powers — as Napoleon I, Emperor of the French. The Constitution established the House of Bonaparte as France's imperial dynasty, making the throne hereditary in Napoleon's family. The Constitution of the Year XII was later itself extensively amended by the so-called "Additional Act" and definitively abolished with the final return of the Bourbons in 1815.