François-Charles Joullain  François-Charles Joullain ( – 1790) was a French art dealer, son of François Joullain, a respected 18th century engraver, publisher and art dealer. The careers of the father and son as merchants of paintings expanded from their roles as printmakers, editors and printsellers. François-Charles Joullain, born in about 1734, was the eldest son of a successful French engraver, art dealer and publisher, François Joullain. The careers of father and son were closely intertwined. Initially, Joullain assisted his father with in his auctioneer's business in Paris. When Charles Joullain married Catherine Louise Leclerc, the daughter of Sébastien Leclerc (1676-1763) in around 1756, his father transferred to him the portion of his business that dealt with frames and he supplied his father with frames for his auctioneer's rooms at "Quai de la Mégisserie à la Ville de Rome, Paris." After his father's death in 1778, he continued to run the family business and became one of the most prominent art dealers in Paris in the second half of the 18th-century. Charles Joullain assumed the name François-Charles Joullain to distinguish himself from the practice with his father in which he had long been closely associated. He was reckoned one of the outstanding experts in the art market of his day. He was one of the experts called in to catalogue the works of art of Abel-François Poisson, marquis de Marigny, the brother of Mme de Pompadour and one of the most enlightened patrons of the day. "Joullain" printseller, was mentioned in Horace Walpole's correspondence with the marquise du Deffand. Francois-Charles Joullain was the author of three works which serve the historian of the art market as a guide to auction house practices in the 18th century: his "Répertoire de tableaux, dessins et estampes, ouvrage utile aux amateurs", 1783, his "Variation de prix concernant les tableaux", 1786, and above all his "Reflexions sur la peinture et la gravure, accompagnées d'une courte dissertation sur le commerce de la curiosité et les ventes en général", Metz, 1786.