John Montgomery Traherne, FRS, FSA, FGS, FLS (5 October 1788 – 5 February 1860) was a Welsh Anglican priest, antiquarian, magistrate and Deputy Lieutenant of County of Glamorgan.
The only son of Llewelyn Traherne, High Sheriff of Glamorgan, he was born at Coedarhydyglyn in 1788, near what is now Culverhouse Cross in western Cardiff.
[1] In 1799, during his father's lifetime, Traherne was virtually adopted by his great-aunt, Mrs. John Llewellin, who covered the cost of his education at private schools and tutors until he entered Oriel College, Oxford, in April 1807.
Through Rackett, Traherne developed an interest for topographical and antiquarian studies and was introduced to the literary and scientific circles of London.
Under various pseudonyms, he authored works on local and South Welsh history, with his best-known publication being Historical Notices of Sir Matthew Craddock of Swansea.
The 123 volumes of the Traherne-Mansel Franklen Manuscripts, which he compiled over the years, are now in the possession of the National Archives of Wales.