Records of the Vivian family, later barons Swansea, of Cornwall and Swansea, including records of the copper industry in Cornwall and Swansea (the Hafod works), 1720-1934; estate papers, 1853-1909; business and personal correspondence, 1807-1934, notably that of John Henry Vivian (1785-1855), and Henry Hussey Vivian, 1st Baron Swansea (1821-1894). The archive is a major source for the 19th century history of Swansea.