Stephen William Williams (1837-99) was born in Lower Mellington, Churchstoke, co. Mont. He married Maria Williams of Rhaeadr, 11 Sept. 1862, in Liverpool Parish Church. He was an archaeologist, antiquary, numismatist and territorial soldier. He was the County Surveyor for Radnorshire, 1862-1899. He died (while High Sheriff of Radnorshire) at Sandown, Isle of Wight on 11 Dec. 1899 and was buried in Rhaeadr churchyard. He had no children. For Stephen William Williams, see: R. W. D. Fenn & J. B. Sinclair, 'Our ubiquitous friend', Trans. Rads. Soc., vol. 20 (1989), pp. 116-134; 'Stephen W. Williams of Penralley, 1833-1899', Arch. Camb., vol. 159 (2000), pp. 89-121; David H. Williams, 'An appreciation of the life & work of Stephen Williams Williams', Mont. Colls., vol. 80 (1992), pp. 55-88; 'SW Williams, 1837-1899, a commemoration', Trans. Rads. Soc., vol. 69 (1999), pp. 116-142. Deunydd perthnasol: Many other papers of Stephen William Williams may be found in the Birmingham Corporation Waterworks collection held in NLW, the records of the Elan Valley Waterworks Committee in the Birmingham Public Reference Library, and at the Powys County Record Office. Arranged into personal papers, 1862-1999 (627-658), Penralley, [late 18 cent]-1904 (659-678), the archaeologist and historian, [c.1824-c.1975] (679-686), Radnorshire Volunteers and miscellanea, [c.1878-late 1890s], 687-690, local affairs, land agent and architectural practice, 691-724 (1864-1900), and Ty-lwch estate, 1867-1910 (725-741).