About John Mackenzie, 6th of Letterewe, WS
"Mackenzie, John, of Letterewe — Apprentice to William Mackenzie and Alexander Monypenny. — Eldest son of Alexander Mackenzie of Letterewe, Ross-shire. Died 4th January 1834, aged 33, unmarried."
SOURCE: The Society of Writers to Her Majesty's Signet; 1890; page 133