Here are some possibilities:
* Louis Ellies Dupin de Francueil: A French diplomat, scholar, and writer, known for his work "Les Lettres de Mme. de Sévigné" (Letters of Mme. de Sévigné), a compilation of letters by Marie de Rabutin Chantal, Marquise de Sévigné.
* François-Elie Dupin: A French politician and lawyer, known for his political and legal writings.
If you could provide more context or details, I might be able to help you find the correct author.