James Boswell's uncle John was a member of a sect known as the Glasites.
Johanna Elizabeth Schartow
Life with Boswell:
Boswell mentions Schartow on July 17, 1764, when he went to a party at her uncle, Friedrich Behmer's, held in honour of her and her fiance, G. F. Stielow. The couple was married on the next day at a ceremony also attended by Boswell.