During his stay in Berlin in 1764, Boswell lived in the house of Karl David Kircheisen, the president of the Berlin city council.
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."