In France in 1852, voters were asked whether they approved of the re-establishment of the Empire in the person of Louis Napoléon Bonaparte,  the only president of what republic?
Napoleon III Louis-Napoléon Bonaparte (born Charles-Louis Napoléon Bonaparte; 20 April 1808 – 9 January 1873) was the President of France from 1848 to 1852 and, as Napoleon III, the Emperor of the French from 1852 to 1870. He was the only president of the French Second Republic and the head of the Second French Empire.
Royal Question The Royal Question (French: "Question royale" , Dutch: "Koningskwestie" ) was a major political crisis in Belgium that lasted from 1945 to 1951, coming to a head between March and August 1950. The "Question" at stake surrounded whether King Leopold III could resume his royal powers and duties as King of the Belgians amid allegations that his actions during World War II had gone contrary to the provisions of the Belgian Constitution. It was eventually resolved by the abdication of Leopold in favour of his son, Baudouin, in 1951.