1 Whilst the spelling of Llanerchaeron has been adopted today, the Lewises at this period, and indeed until the extinction of the line, styled it Llaniron (or Llanaeron) in letters and legal documents. 2 R. Laidlaw and C. Palmer, Historic Landscape Survey, Llanerchaeron (The National Trust, 1999). 3 NLW MS Nanteos A 1 4 M. Lloyd Evans, Llanerchaeron (Y Lolfa, 1994). 5 NLW MS Llanaeron 118. 6 H.A. Colvin, Biographical Dictionary of British Architects 1600-1840 (3rd ed., 1995). 7 NLW Bishop's transcripts, Aberystwyth Parish. 8 NLW maps Nanteos 105. 9 NLW maps Nanteos 20,21. 10 NLW maps Nanteos 89. 11 NLW maps Nanteos 27. 12 NLW MS Llanaeron 114. 13 NLW MS Llanaeron Rentals 1854. 14 C. Palmer, in Nanteos ed. Gerald Morgan, in prep. 15 R. Suggett, John Nash, Architect in Wales (NLW Aberystwyth, 1995), pl04.