The Hundred Days is the period between Napoleon Bonaparte’s return to Paris on 20 March 1815 from his exile on Elba, and the restoration of the Bourbon Dynasty under King Louis XVIII on 8 July 1815 (a period of 111 days).

This period is also known as the War of the Seventh Coalition, and includes the Waterloo Campaign and the Neapolitan War.

The phrase les Cent Jours is first used by the prefect of Paris, the comte de Chabrol, in his speech welcoming the King.Napoleon returns during the Congress of Vienna.

On 13 March, seven days before Napoleon reaches Paris, the powers at the Congress of Vienna declare him an outlaw; four days later the United Kingdom, Russia, Austria and Prussia, members of the Seventh Coalition, bind themselves to put 150,000 men each into the field to end his rule.

This sets the stage for the last conflict in the Napoleonic Wars, the defeat of Napoleon at the Battle of Waterloo, the restoration of the French monarchy for the second time and the permanent exile of Napoleon to the island of Saint Helena, where he will die in May 1821.