Napoleon’s reign after his return from exile on Elba is called this.
The Revival
The Hundred Days
The Restoration
The Grand Days
The Hundred Days (actually 111 days between March 20, 1815, and July 8, 1815). Napoleon returned from Elba and seized control of France again. The Hundred Days ended with the return of King Louis XVIII after the Emperor of the French had been finally defeated at Waterloo.