Francis Beaufort Palmer (February 2007), Peerage Law in England, Lawbook Exchange, ISBN978-1-58477-748-9, OL9452596M, 1584777486 See Appendix, p242; also Theophilus Jones (1805), A history of the county of Brecknock, Brecknock: Printed and sold by Wm. & Geo. North ... for the author; and sold by J. Booth ... London., OL14012583M p67