_. The Lady Cynthia Postan, who died 12 November, 2017, aged 99, was a debutante & MI5 secretary who wrote official reports on jet engines before becoming an expert of plants and porcelain. She was a scion of the Earls of Albemarle.
She was born Lady Cynthia Rosalie Keppel, 25 June, 1918, the second daughter of the 9th Earl of Albemarle (1882-1979), by his first wife Lady Judith Sydney Myee Wynn-Carrington (d 1928), fourth daughter of the 1st and last Marquess of Lincolnshire, KG.
She married 8 Dec, 1944, Professor Michael Moissey Postan (who d 1981), by whom she had issue.