Short answers, pulled from the story.
Napoleon Bonaparte stopped in Liège on the 1st of August 1803 for two days during his triumphal march across nine annexed départements. The city's population tripled during those brief two days of his visit.
Jean-Auguste-Dominique Ingres was only twenty-three years old when he received the commission from the city of Liège to paint this work. He based the pose on a portrait created in 1802 by Antoine-Jean Gros since he could not get Bonaparte to sit for the actual painting.
The painting shows Napoleon Bonaparte with his right hand positioned to sign an act titled Faubourg d'Amercœur rebâti. This decree refers to one signed by Napoleon Bonaparte in 1803 to restore the suburb and demonstrate the benefits of being part of France.
The background depicts St. Lambert's Cathedral in Liège as complete even though it was actually being demolished during the Liège Revolution. The visual contradiction symbolized the resumption of good relations between France and the papacy through the Concordat of 1801.
Ingres became one of five artists commissioned to paint full-length portraits distributed among newly ceded French towns including Antwerp, Dunkerque, Brussels, and Ghent. Five artists including Jean-Baptiste Greuze, Robert Lefèvre, Charles Meynier, and Marie-Guillemine Benoist created similar works for other prefectural towns.