Focus on Napoleon as Mars the Peacemaker and explain the History.
At Napoleon's personal and insistent demand, Canova went to Paris in 1802 to model a bust of him. In 1803, after his return to Rome, he began work on the full-length sculpture; it was completed in 1806.: 93  Its idealised nude physique draws on the iconography of Augustus, and it was always intended for an interior entrance-hall setting rather than as a freestanding piazza sculpture, though some accounts give the centre of the courtyard of the Palazzo del Senato as the original intended site for the sculpture, following plans drawn up by the architect Luigi Canonica. France's ambassador in Rome François Cacault and the director of French museums Vivant Denon both saw the sculpture while it was a work in progress: Cacault wrote in 1803 that it "must become the most perfect work of this century", whilst Denon wrote back to Napoleon in 1806 that it belonged indoors in the Musée Napoléon "among the emperors and in the niche where the Laocoon is, in such a manner that it would be the first object that one sees on entering". In late 1810 the sculpture was transported to France, reaching  Paris on 1 January 1811.: 100  When Napoleon saw it there in April 1811 he refused to accept it, calling it "too athletic" and banning the public from seeing it.
By 1814 the sculpture was in the Salle des Hommes Illustres, hidden behind a canvas screen, where it was probably first seen by Wellington. In the era after the battle of Waterloo, Canova, who was still regarded as the best living artist, with his works in great demand from English patrons in particular, supported the return of looted sculptures from the Musée Napoléon to their original collections. The Musée Napoléon reverted to being the Louvre and its looted sculptures such as the Apollo Belvedere were returned to their original collections. The removal of the Napoleon was also mooted, and Canova offered to re-purchase it. It was sold to the British government in 1816 for 66,000 francs (then under £3,000), which the Louvre spent on re-installing its Salle des Antiques. Works by Canova were already being collected by the Duke, and the Prince Regent presented it to him later that year. It was moved to the stairwell in Apsley House in 1817, where the floor under the statue was specially strengthened in order to accommodate the additional weight. It is still on display there.
Napoleon Laocoon Musée Napoléon battle of Waterloo Apollo Belvedere Louvre François Cacault Apsley House Prince Regent Luigi Canonica Augustus Vivant Denon