In late-February 1787, the Assembly of Notables was convened. Von Fersen attended the closing of the last day of that meeting, and described the gathering as "imposing". von Fersen was secretly entrusted, by Gustavus III, with the role of special envoy to the King and Queen of France. Some sensitive diplomatic contacts between Sweden and France were conducted, not through the Swedish embassy, but through von Fersen. To be closer to Paris, he moved into a house in Auteuil borrowed from Count Esterhazy.