From 1852 the Hôtel Drouot was the space where the French auctioneers (Commissaires-Priseurs) – who held a stately sanctioned monopoly – organized their auctions. By processing data from the art auction catalogue repertory by Frits Lugt and the extended version Art Sales Catalogues Online, it is possible to map the networks of art marketing at the early Hôtel Drouot.