James Boswell's uncle John was a member of a sect known as the Glasites.
Henriette Katharina Agnes von Anhalt-DessauBorn 1744
Princess of Anhalt-Dessau, daughter of Leopold II Maximillian of Anhalt-Dessau (1700-1751) and Giesela Agnes of Anhalt-Köthen (1721-1751). She married Johann Just, Freiherr von Löen (1737-1803) in 1779, and had at least two children, Leopoldina Casimira and Friedrich.
Life with Boswell:
Boswell was introduced to her at the court of Dessau on September 24, 1764. He danced with her, and with her two sisters, at a ball on September 29, held by the Princess Wilhelmine in honour of the deposed Duke of Courland.
On September 30, 1764 - the day of his taking leave of Dessau - he described the Princess as "a comely, black, amiable young lady."