Charles Messier was a French astronomer. He published an astronomical catalogue consisting of 110 nebulae and star clusters, which came to be known as the Messier objects, referred to with the letter M and their number between 1 and 110. Messier's purpose for the catalogue was to help astronomical observers distinguish between permanent and transient visually diffuse objects in the sky.

The Musée de Cluny, officially Musée de Cluny-Musée National du Moyen Âge, is a museum of medieval art in Paris. It is located in the 5th arrondissement of Paris, bordered by square Samuel-Paty to the south, boulevard Saint-Michel to the west, boulevard Saint-Germain to the north, and rue Saint-Jacques to the east.