[5] In response, she wrote, "The Duchess of Queensberry is surprised and well pleased that the King hath given her so agreeable a command as to stay from Court.

"[6] In her later years, she attracted attention for dressing in the same fashion as in her youth, which was considered eccentric, refusing 'to cut and curl my hair like a sheep's head, or wear one of their trolloping sacks'.

[4] In 1764, Julius Soubise, an Afro-Caribbean slave,[7] was given to the duchess by Royal Navy Captain Stair Douglas, a relative of hers, and she manumitted (freed) him.

[7] She gave Soubise a privileged life, treating him as if he were her own son – apparently with her husband's blessing.

[9][7] The personal favour and patronage of the duchess allowed Soubise a lifestyle of socializing and fashion.

[13][14] William Austin's well-known satirical print, The Duchess of Queensbury and Soubise (published 1 May 1773) shows the pair engaged in a fencing match.

[7][18] This work has reappeared historically under several titles, including  "The Eccentric Duchess of Queensbury fencing with her protégé the Creole Soubise (otherwise 'Mungo')” and "The Duchess of Queensberry playing at foils with her favorite Lap Dog Mungo after Expending near £10,000 to make him a—.”[18] This article incorporates text from a publication now in the public domain: "Hyde, Catherine".