It's possible you're thinking of Edme-François Gersaint, a famous art dealer in 18th century Paris. He is known for his shop, "A la Ville de Gersaint", and his involvement in the art world of the time. However, there's no specific "creation date" for Gersaint himself, as he lived from 1694 to 1750.
Please provide more information if you're referring to something else, so I can assist you better.