Final answer:
The painting description does not align with the themes often depicted by Eugène Delacroix, who is known for works like 'Liberty Leading the People'. It could instead be attributed to Jacques-Louis David or Francisco Goya, given their history of painting aristocratic scenes. Honing in on the exact artist requires a visual confirmation.
Step-by-step explanation:
The artist who created the work described - a painting of a group of people dressed in aristocratic clothing, set against a backdrop of large paintings displayed in a room in the palace - is more likely to be Jacques-Louis David or Francisco Goya, rather than Eugène Delacroix. Delacroix is most famous for his work 'Liberty Leading the People', which commemorates the July Revolution of 1830 and is characterized by its Romantic style, depicting people fighting for liberty with the French flag - quite different from the description provided.
Jacques-Louis David is known for his Neoclassical style and his painting could reflect the aristocracy, whereas Francisco Goya also depicted the Spanish society and its aristocracy. Unfortunately, without a visual confirmation, it's not possible to determine with certainty which artist created the specific work described. However, Delacroix's themes are often associated with revolutionary subjects and not the calm display of aristocracy.