Editing Gregynog Hall (section)

==History==
The original mansion was rebuilt in the 1840s by [[Charles Hanbury-Tracy, 1st Baron Sudeley]]. Its concrete cladding, designed to replicate the black-and-white [[Timber framing|timber-framed]] architecture of Montgomeryshire farmhouses, is among the earliest examples of concrete use in building in the modern era. The Sudeleys were also pioneers of the use of concrete in the building of new cottages and farmhouses on the Gregynog estate, and many [[Cadw]]-listed examples can still be seen in Tregynon and the surrounding countryside. At its largest, the Gregynog estate was over {{convert|18,000|acre|km2}} in extent, but the estate was broken up in 1913, leaving the mansion with {{convert|750|acre|km2}} of farms, woodlands and formal gardens. The sunken garden and [[arboretum]] are of particular note.<ref>Hughes, Glyn Tegai (ed.) ''Gregynog''. Cardiff: University of Wales Press, 1977</ref> The gardens and park are listed at Grade I on the [[Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales]].<ref>{{NHAW|uid=347|num=PGW(Po)33(POW)|desc=Gregynog|class=HPG|access-date=6 February 2023}}</ref>