James Boswell's uncle John was a member of a sect known as the Glasites.
William MackenzieBorn 1730
Son of Kenneth Mackenzie of Assynt and Frances Mackenzie (dau of Alexander Mackenzie of Conansbay). A student from the Scots College at Douai and sometime prior of the Scots monastery, St. James's Abbey, in Würzburg.1
Identified by Boswell only as "Mr. Mackenzie a relation of the Seaforth family who has been a very long time abroad [...] and spoke french like a Parisian". 2
Life with Boswell:
Mackenzie waited on Boswell at Dresden on October 12, 1764, and it is uncertain whether the two ever met more than this one time.
Note 1: Sources include Stirnet and The Journal of his German and Swiss Travels, 1764, p. 160
Note 2: Journal entry October 12, 1764