Louis-Napoléon Bonaparte (20 April 1808 – 9 January 1873) was the only President (1848–52) of the French Second Republic and, as Napoleon III, the Emperor (1852–70) of the Second French Empire. He was the nephew and heir of Napoleon I. He was the first President of France to be elected by a direct popular vote. When he was blocked by the Constitution and Parliament from running for a second term, he organized a coup d'état in 1851, and then took the throne as Napoleon III on 2 December 1852, the forty-eighth anniversary of Napoleon I's coronation. He remains the longest-serving French head of state since the French Revolution.