Secretary of the Tuscan legation to France from 1767. A friend of Ingenhousz and an acquaintance of Choiseul, Mirabeau, Du Pont de Nemours, and the duchesse d’Enville. Probably met Franklin during one of his early visits to France. Franklin was in contact with him soon after his arrival in Paris (1776). An ardent supporter of the American cause, he was reputed to be one of the authors of the “Memoir and Supplemental Observations,” which argued for an immediate French declaration of war against the British (1777).

Uncle of Francesco Favi.