The original house and
deer park of
Old Gwernyfed (), to the south of the village, is of medieval origin, but the house was extensively rebuilt in the 17th century. In 1600 it was purchased by Sir David Williams,
MP for the
Borough of Brecon (1584–93, 1597–1604). In 1613, it was inherited by his son, Sir Henry Williams, MP for the Borough of Brecon (1601–04) and for
Breconshire (1620–28). His son, also
Sir Henry Williams, was also MP for Breconshire (1628–29). On 6 August 1645, he was said to have entertained
King Charles I at Gwernyfed, following Charles' defeat at the
Battle of Naseby.
Sir Edward Williams was not a relation (despite his surname), but married the family heiress in 1675. This seems to have ensured that he too became MP for Breconshire (1697–98, 1705–21). The house is now a
grade I listed building. The gardens and park are listed at Grade II* on the
Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales. Gwernyfed Park, a much later
Jacobean-style house within the deer park, was built for Captain Thomas Wood by
William Eden Nesfield in the 1870s. During the Second World War, it was requisitioned and used by the
South Wales Borderers. Since 1950, it has formed part of
Gwernyfed High School. A
rugby union club,
Gwernyfed RFC, was founded at the school in the 1960s, but now plays at and represents the nearby town of
Talgarth. Gwernyfed Park is now a
grade II* listed building. ==Aberllynfi parish and community==