Apelles

A horse (painting) also exists, or did exist, painted for a competition, in which he appealed from the judgement of men to that of dumb beasts. When he saw that his rivals were likely to be placed above him through intrigue, he caused some horses to be brought in and showed them each picture in turn; they neighed only at the horse of Apelles, and this was invariably the case ever afterwards, so that the test was applied purposely to afford a display of his skill.

Pliny the Elder on the History of Art

Reconstruction of a mosaic depiction of the Battle of Issus after a painting supposed to be by Apelles or Philoxenus of Eretria found in the House of the Faun at Pompeii