With thanks to the Royal Commission on the Ancient and Historical Monuments of Wales for supporting the publication of this article. The Royal Commission is the investigation body and national archive for the historic environment of Wales. It has the lead role in ensuring that Wales's archaeological, built and maritime heritage is authoritatively recorded and seeks to promote the understanding and appreciation of this heritage nationally and internationally. The National Monuments Record of Wales is available for consultation via http://www.coflein.gov.uk. Thanks also to Professor Martin Bell and Dyfed Archaeological Trust for providing photographs for this article.
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