Mary Shepherd

Lady Mary Shepherd, born Primrose, was a Scottish philosopher of the early nineteenth century, working within the empiricist tradition and the epistemological debates then active in Edinburgh. She published only two philosophical books, in 1824 and 1827, yet Robert Blakey described her as an influential figure in the Edinburgh philosophy of her day.

Born in 1777 at Barnbougle Castle, on the Firth of Forth near Dalmeny, she was the second of five daughters of the 3rd Earl of Rosebery. Educated at home by a private tutor, Pillans, she received a demanding and individually tailored schooling in history, mathematics, geography and Latin. In 1808 she married the English barrister Henry John Shepherd and moved to London, where she lived for the rest of her life. Her husband was more drawn to the theatre, but the marriage gave her considerable freedom to pursue philosophy.

Her two books examined core questions of the theory of knowledge. The first considered the relation between cause and effect, criticising David Hume, Thomas Brown and the physiologist William Lawrence. The second addressed perception of an external world, arguing against George Berkeley's idealism and against Thomas Reid's reliance on natural instinct. Her correspondence shows sustained engagement with these problems, including a public dispute with the amateur philosopher John Fearn.

Her influence is most visible within her circle. William Whewell used one of her works as a textbook at Cambridge, and friends such as Charles Babbage, David Ricardo and Samuel Taylor Coleridge acknowledged what they owed her. She died in London in 1847.