Napoleon's coronation took place on December 2, 1804. Two separate crowns were brought for the ceremony: a golden laurel wreath recalling the Roman Empire and a replica of Charlemagne's crown. Napoleon entered the ceremony wearing the laurel wreath and kept it on his head throughout the proceedings. For the official coronation, he raised the Charlemagne crown over his own head in a symbolic gesture, but never placed it on top because he was already wearing the golden wreath. Instead he placed the crown on Josephine's head, the event commemorated in the officially sanctioned painting by Jacques-Louis David. Napoleon was also crowned King of Italy, with the Iron Crown of Lombardy, at the Cathedral of Milan on May 26, 1805. He created eighteen Marshals of the Empire from amongst his top generals to secure the allegiance of the army.

On what date did Napoleon's coronation occur?