The ill-fated mountaineer George Mallory's only book was "Boswell the Biographer"?
Half-brother to the wife of Karl David Kircheisen.
Life with Boswell:
Boswell met him at the Kircheisens in Berlin on August 27, 1764, describing him as a "captain of the cavalry, [who] was so much wounded that he quitted the service. He is a changable, splenetic, unhappy man."