The Oath of the Horatii painted by Jacques Louis David in Rome represents all the elements of the style of Neo-Classicism. It is completed in 1784 as oil on canvas. This painting is not only one of the hallmark paintings of the style of Neo-Calssicism and Davis’s well-known pieces, but also possesses the time significance for the Art history of France. The theme of the painting is to advocate heroism and fortitude, and that personal feelings should be subordinated to the national interest