Rhiwlas estate records, [c. 1563], 1609-1888, including deeds, 1609-1888; rentals, 1796-1855; legal papers, [c. 1563], [c. 1632]-1847, including papers relating to a 19th century dispute about diverting the river Meloch; family and personal papers, 1631-1937, including family trust papers relating to the estate of Thomas Jones (d. 1819), rector of Derwen, Montgomeryshire, and brother-in-law of Richard Watkin Price; non-family trust papers relating to the estate of John Lloyd of Wigfair and Hafodunos; and letters, mainly from the first half of the 19th century, mainly to Richard Watkin Price.