Paternity
Speculation about his paternity was a favorite topic of his detractors, as his parents were estranged and his mother Hortense was known to have multiple lovers; however, the parents met briefly between 23 June and 6 July 1807, nine and a half months prior to his birth, and there is no reason to assume that Louis was not his father. Additionally, Article 312 of the Napoleonic Code stated (and still states) that the father of any child born within wedlock is the mother's husband. The meeting prior to his birth meant that there was no "impossibility" of conception, and that the Article 312 designated Louis as the father of the future Napoleon III.
Read more about this topic: Napoleon III