Napoleon
During the Consulate, Napoleon faced several royalist and Jacobin assassination plots, including the Conspiration des poignards (Dagger plot) in October 1800 and the Plot of the Rue Saint-Nicaise (also known as the Infernal Machine) two months later. In January 1804, his police uncovered an assassination plot against him that involved Moreau and which was ostensibly sponsored by the Bourbon family, the former rulers of France. On the advice of Talleyrand, Napoleon ordered the kidnapping of the Duke of Enghien, violating the sovereignty of Baden. The Duke was quickly executed after a secret military trial, even though he had not been involved in the plot. Enghien's execution infuriated royal courts throughout Europe, become one of the contributing political factors for the outbreak of the Napoleonic Wars.
What  family was supposed to have supported the January 1804 assassination plot targeting Napoleon?
the Bourbon family
In January 1804, his police uncovered an assassination plot against him that involved Moreau and which was ostensibly sponsored by the Bourbon family, the former rulers of France.
Napoleon