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.
Batavian Republic constitutional referendum, 1801 A constitutionial referendum was held in the Batavian Republic on 6 October 1801. After a previous referendum in 1798 resulted in a new constitution being approved, the French were not satisfied with this constitution, and under their influence a new constitution was written.