James Boswell's uncle John was a member of a sect known as the Glasites.
Gijsbert Jan van HardenbroekBorn 1720
Son of Jan Louis van Hardenbroek (d. 1747) and Jeanne Charlotte van Renesse (1695?-1723).
In 1755 he bought Bergestein from the Borre de Amerongen family, enabling him to join the Utrecht "corps of nobles", which he did in 1758. Stewart-General of Utrecht. Utrecht representative in the Amsterdam chamber of the East-India Company (1759-1764). Deputy to the States General (1767-1785).
According to Strier, van Hardenbroek proposed to Belle de Zuylen at some time after 1767 (probably in 1770), but at a time when she had already decided to marry Charles-Emmanuel de Charriere and leave Utrecht.1
Life with Boswell:
Note 1: A two-page biography of van Hardenbroek can be found in Isabelle de Charriere (Belle de Zuylen): Early Writings; New material from Dutch Archives by C.D. and K. van Strien (2005), p. 44-45. (available via AbeBooks.com