Biography
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.
Life with Boswell
Boswell had some conversation with L'Estocq at the Court of Dessau on September 26, 1764.