James Boswell's uncle John was a member of a sect known as the Glasites.
Henning Adam von Bassewitz
Almost certainly a close relation of Lütke Cuno Wolfradt von Bassewitz (1728-1796), Hauptmann of Brunswick-Wolfenbüttel, son of Ludolph Friedrich von Bassewitz and Magdalene Sybille.
Life with Boswell:
Boswell visited the Lord Chamberlain upon his return to Brunswick on August 8, 1764.