The Charter of 1815, signed on April 22, 1815, was the French constitution prepared by Benjamin Constant at the request of Napoleon I when he returned from exile on Elba. More correctly known as the "Additional Act to the Constitutions of the Empire" the document extensively amended (in fact virtually replacing) the previous Napoleonic Constitutions (Constitution of the Year VIII, Constitution of the Year X and Constitution of the Year XII). The Additional Act reframed the Napoleonic constitution into something more along the lines of the Bourbon Restoration Charter of 1814 of Louis XVIII, while otherwise ignoring the Bourbon charter's existence. It was very liberal in spirit, and gave the French people rights which had previously been unknown to them, such as the right to elect the mayor