In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Q: On 6 April 1814, Napoleon abdicated his throne, leading to the accession of Louis XVIII and the first Bourbon Restoration a month later. The defeated Napoleon was exiled to the island of Elba off the coast of Tuscany, while the victorious Coalition sought to redraw the map of Europe at the Congress of Vienna.
A: 
who ruled for one hundred days and when