Mid-century Europe was tired of Rococo prettiness, and the buried Roman cities were coming up out of the ground. A German scholar told painters to imitate the Greeks and chase a noble simplicity and quiet grandeur, and in Jacques-Louis David they found a master who painted civic duty with a draughtsman’s hardness. The same severe style then became the official look of the French Revolution and of Napoleon.
Before David, elite painting was Rococo (the light, ornamental, aristocratic style made for private pleasure). The palette was pastel, the brushwork feathery and visible, the composition swung on soft curves, and the subjects were flirtation and mythological play. Fragonard’s Swing is the textbook case: pretty, weightless, and about nothing more than delight.
Neoclassicism strips all of that out. The palette goes severe and local (stone, steel, blood-red), the brushwork goes smooth and nearly invisible so the figures read as carved marble, the stage goes shallow and frieze-like with the action pressed forward, and the subject becomes stoic duty from Greek and Roman history. Above all, clear LINE replaces soft color as the thing carrying the picture, you could trace every figure with a pencil.
That is why this is a new movement and not a new fashion. The canvas stops being a decoration on a salon wall and becomes an argument: art as a public lesson in virtue. Within a decade that same severe style would be drafted as the official image of the French Revolution.
The Neoclassical painters never wrote a manifesto. Their creed was written for them, by a man who could not paint. In 1755 a German scholar named Johann Joachim Winckelmann published a slim essay (the first edition was a run of about fifty copies) telling artists to stop inventing and start imitating the Greeks, whose supreme quality he named in a phrase that became the movement’s motto: a noble simplicity and quiet grandeur.
Anton Raphael Mengs, Winckelmann’s friend, tried to paint the doctrine in his Parnassus ceiling of 1761, often called the first programmatic Neoclassical picture. David, thirty years later, actually did. So the founding document of an art of severe, drawn, moral pictures is a piece of art criticism.
One honest footnote on the famous line. The first English translator, Henry Fuseli, rendered stille Größe in 1765 as sedate grandeur, not quiet grandeur. The smoother quiet grandeur is the modern standard wording everyone quotes now. The open source below lets the reader check Fuseli’s own words.