Identified only as "Blanchot" by Boswell. The notes to Boswell on the Grand Tour suggest he might have been a Johan Mikael Blanc. According to Boswell "in the service of the Swedish ambassador" and "a fellow of knowledge and clear expression".
Boswell spent some time with Blanchot and Hübner in Berlin on September 3 and 4, 1764. On the 4th "Blanchot and Hübner drank a glass of wine with me at my lodgings, and Blanchot showed me on the map my route to Geneva, so as to take several German cities and courts in my way."