Final answer:
Jacques-Louis David served as Napoleon's official painter after the French Revolution. He created paintings that displayed symbolism and established Napoleon's lineage and legitimacy.
Step-by-step explanation:
Jacques-Louis David was the personal painter of Napoleon Bonaparte. After the French Revolution, when Napoleon became Emperor of France, David served as his official painter. David idolized Napoleon and even signed and dated his famous painting 'Napoleon Crossing the Alps' on the horse's breastplate. This painting and other art produced in support of Napoleon's reign displayed symbolism, ambiguity, and established the emperor's lineage and legitimacy.