Estate and family records of Mansel, later Talbot, of Penrice, and its estates in Gower, Glamorgan, from the 16th cent.; including records of Margam Abbey, 12-19th cent., including charters from its foundation in c. 1147, together with royal charters, charter rolls and papal bulls, which form one of the most complete series of archives of any medieval abbey in Great Britain; substantial early archives for Penrice, and other estates, mostly in Glamorgan; manorial records for the manor of Margam Abbey and others; early records of the coal industry in Glamorgan; a large group of Mansel correspondence, 1568-1848, along with some papers relating to Williams of Plas Dyffryn Clydach, largely literary, 17th cent.-18 cent.