Jean Louis L'Estocq
Referred to by Boswell only as "L'estocq", the editors of Boswell on the Grand Tour I identifies him as a Jean Louis L'Estocq.
According to Boswell, he was formerly (i.e. before September 1764) tutor to the princes of Anhalt-Dessau, probably Albrecht, and Johann George and possibly even to the then reigning Prince Leopold III.
Boswell had some conversation with L'Estocq at the Court of Dessau on September 26, 1764.