Three years after his birth in Paris, the First French Empire - to which he was heir - collapsed, and Napoleon Bonaparte abdicated the throne in favour of his infant son, who was taken by the empress to Chateau Blois in April 1814. In 1815, after his defeat at Waterloo, Napoleon again abdicated in favour of his son.
The French Legislative Assemblies recognised him as Emperor from 22 June1815 but they voted to restore Louis XVIII on 8 July, 1815. Despite this short technical reign, he is not normally referred to as "Napoleon II" except by Bonapartists who also call him the King of Rome. Nevertheless, the next Napoleon to come to the throne of France took the name Napoleon III in deference to him.
NAPOLEONII 1811–32, son of Napoleon I and Marie Louise, known as the king of Rome (1811–14), as the prince of Parma (1814–18), and after that as the duke of Reichstadt.
Napoleon's abdication in 1815 was in favor of his son, so that he was known to the Bonapartists as NapoleonII, although he never ruled.
NAPOLEONII 1811 32, son of Napoleon I and Marie Louise, known as the king of...1815 was in favor of his son, so that he was known to the Bonapartists as NapoleonII, although he never ruled.
He was Napoleon Francis Joseph Charles, Duke of Reichstadt, the only son of Napoleon I (the one everybody's heard of) and Marie Louise, Archduchess of Austria, Duchess of Parma.
Napoleon abdicated in favor of his son, but events prevented the reign of NapoleonII from being more than titular.
So the future Napoleon III was the nephew, not the grandson, of the first Napoleon.